Which of the following functional groups is present in alcohols?

Correct Option: C. Solution: The functional group present in alcohols is -OH.

How many covalent bonds are present in a molecule of ethane (C₂H₆)?

Correct Option: B. Solution: Ethane has 7 covalent bonds: 6 C-H bonds and 1 C-C bond.

Carbon and its Compounds

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CBSE Learning Objectives – Key Concepts & Skills You Must Know

Learning Objectives

Understand the significance of carbon in various compounds.
Identify the properties of carbon that contribute to its versatility.
Explain the concept of covalent bonding in carbon compounds.
Describe the different classes of organic compounds and their nomenclature.
Recognize the importance of functional groups in determining the properties of carbon compounds.
Differentiate between saturated and unsaturated carbon compounds.
Analyze the structure and properties of various carbon allotropes, including diamond and graphite.
Explore the concept of homologous series in organic chemistry.

CBSE Revision Notes & Quick Summary for Last-Minute Study

Chapter 4: Carbon and its Compounds

Introduction

Study of interesting compounds and their properties.
Focus on carbon, an element of immense significance.

Importance of Carbon

Carbon is present in food, clothes, medicines, and living structures.
Earth’s crust contains only 0.02% carbon; atmosphere has 0.03% carbon dioxide.
Despite its small amount, carbon's importance is immense.

4.1 Bonding in Carbon - The Covalent Bond

Comparison with ionic compounds: ionic compounds have high melting/boiling points and conduct electricity.
Carbon forms covalent bonds by sharing electrons.
Carbon can form chains: straight, branched, or rings.

4.2 Versatile Nature of Carbon

Carbon's tetravalency and catenation lead to a vast number of compounds.
Covalent bonds allow carbon to bond with itself and other elements (H, O, S, N, Cl).
Carbon compounds can be saturated (single bonds) or unsaturated (double/triple bonds).

4.2.1 Saturated and Unsaturated Carbon Compounds

Saturated Compounds: Only single bonds (e.g., Ethane - C₂H₆).
Unsaturated Compounds: Contain double or triple bonds (e.g., Ethene - C₂H₄).

4.2.2 Homologous Series

Series of compounds with the same functional group but different carbon chain lengths.
Example: Alcohols (Methanol, Ethanol, Propanol, Butanol).

4.2.3 Nomenclature of Carbon Compounds

Naming based on carbon chain and functional group.
Method:
1. Identify number of carbon atoms.
2. Indicate functional group with prefix/suffix.
3. Modify name if suffix begins with a vowel.
4. Change 'ane' to 'ene' or 'yne' for unsaturated compounds.

Table 4.4: Nomenclature of Organic Compounds

Class of compounds	Prefix/Suffix	Example
1. Halo alkane	Prefix-chloro, bromo, etc.	Chloropropane (H-C-C-C-Cl)
2. Alcohol	Suffix - ol	Propanol (H-C-C-C-OH)
3. Aldehyde	Suffix - al	Propanal (H-C-C-C=O)
4. Ketone	Suffix - one	Propanone (H-C-C-C-H)
5. Carboxylic acid	Suffix oic acid	Propanoic acid (H-C-C-C-OH)
6. Alkenes	Suffix - ene	Propene (H-C-C=C)
7. Alkynes	Suffix - yne	Propyne (H-C≡C-H)

Conclusion

Carbon's unique properties allow for a vast array of compounds, essential for life and various applications.

CBSE Exam Tips, Important Questions & Common Mistakes to Avoid

Common Mistakes and Exam Tips

Common Pitfalls

Misidentifying Functional Groups: Students often confuse functional groups such as alcohols, aldehydes, and ketones. Ensure you understand the suffixes and prefixes associated with each class of compounds.
Incorrect Bonding Representation: When drawing structures, students may forget to represent double or triple bonds correctly, leading to inaccurate molecular representations.
Neglecting Carbon's Tetravalency: Failing to account for carbon's tetravalency can result in incorrect molecular formulas and structures.
Overlooking Isomerism: Students may not consider structural isomers when asked about compounds with the same molecular formula.

Tips for Success

Practice Drawing Structures: Regularly practice drawing the structures of various carbon compounds to reinforce your understanding of bonding and functional groups.
Memorize Prefixes and Suffixes: Familiarize yourself with the nomenclature rules for organic compounds, including common prefixes and suffixes for functional groups.
Understand Homologous Series: Recognize the patterns in homologous series, including how the properties change with increasing molecular mass.
Review Properties of Compounds: Make sure to review the physical and chemical properties of different classes of carbon compounds to answer comparative questions effectively.

CBSE Quiz & Practice Test – MCQs, True/False Questions with Solutions

Multiple Choice Questions

Formation of alcohols

Formation of saturated hydrocarbons

Formation of ketones

Formation of aldehydes

Correct Answer: B

Solution:

Unsaturated hydrocarbons add hydrogen in the presence of catalysts such as nickel to form saturated hydrocarbons. This process is known as hydrogenation.

Ethyl acetate

Acetaldehyde

Ethene

Ethanol

Correct Answer: A

Solution:

The reaction between ethanoic acid and ethanol in the presence of concentrated sulfuric acid is an esterification reaction, producing ethyl acetate as the main product.

Ethanoic acid

Ethene

Methane

Ethyl acetate

Correct Answer: B

Solution:

When ethanol is heated with excess concentrated sulfuric acid at 443 K, it undergoes dehydration to form ethene (CH₂=CH₂) and water. Sulfuric acid acts as a dehydrating agent.

Carbon forms ionic bonds with other elements.

Carbon forms covalent bonds by sharing electrons.

Carbon forms metallic bonds with metals.

Carbon does not form bonds with other elements.

Correct Answer: B

Solution:

Carbon forms covalent bonds by sharing electrons between atoms to achieve a filled outer shell.

Hydrogenation of vegetable oils

Oxidation of ethanol to ethanoic acid

Chlorination of methane

Dehydration of ethanol to ethene

Correct Answer: C

Solution:

In the chlorination of methane, chlorine replaces hydrogen atoms, making it a substitution reaction.

Ethanol is a solid at room temperature.

Ethanol is insoluble in water.

Ethanol is a good solvent and is soluble in water.

Ethanol is a gas at room temperature.

Correct Answer: C

Solution:

Ethanol is a liquid at room temperature and is soluble in water, making it a good solvent.

Carboxylic acid

Aldehyde

Ketone

Alcohol

Correct Answer: C

Solution:

Butanone contains the ketone functional group, which is characterized by a carbonyl group (C=O) bonded to two carbon atoms.

1 gram

2 grams

3 grams

4 grams

Correct Answer: B

Solution:

The balanced chemical reaction is: 2Na + 2C₂H₅OH → 2C₂H₅ONa + H₂. The molar mass of ethanol is 46 g/mol. From the equation, 2 moles of ethanol produce 1 mole of H₂ (2 grams). Therefore, 46 grams of ethanol (1 mole) will produce 1 gram of H₂. Hence, the correct answer is 2 grams.

Carbon has a high atomic mass.

Carbon has the ability to form ionic bonds.

Carbon exhibits catenation and tetravalency.

Carbon is a metal.

Correct Answer: C

Solution:

Carbon's versatility is due to its ability to form long chains (catenation) and its tetravalency, allowing it to bond with four other atoms.

An alcohol

A haloalkane

An aldehyde

A carboxylic acid

Correct Answer: B

Solution:

Replacing a hydrogen atom in methane with a chlorine atom results in the formation of a haloalkane, specifically chloromethane.

They have high melting and boiling points.

They conduct electricity in molten state.

They are generally poor conductors of electricity.

They are always soluble in water.

Correct Answer: C

Solution:

Covalent compounds are generally poor conductors of electricity because they do not have free ions or charged particles.

Carbon can form ionic bonds easily.

Carbon has a high atomic mass.

Carbon exhibits catenation and tetravalency.

Carbon is a metal.

Correct Answer: C

Solution:

Carbon's ability to form long chains (catenation) and its tetravalency allow it to form a large number of compounds.

Ethanol is oxidized to ethanoic acid.

Hydrogen gas is evolved.

Ethanol is dehydrated to form ethene.

Ethanol forms a precipitate.

Correct Answer: B

Solution:

When ethanol reacts with sodium, hydrogen gas is evolved, and sodium ethoxide is formed.

N-N

N=N

N≡N

N=N=N

Correct Answer: C

Solution:

The structural formula for a molecule with a triple bond between two nitrogen atoms is N≡N, representing the nitrogen molecule (N₂).

Oxidation with KMnO₄

Dehydration using concentrated H₂SO₄

Hydrogenation with Ni catalyst

Substitution with Cl₂

Correct Answer: B

Solution:

Ethanol is converted to ethene by dehydration, which involves heating ethanol with concentrated sulfuric acid (H₂SO₄) to remove water.

Ethene

Ethanol

Ethane

Ethyl chloride

Correct Answer: B

Solution:

Ethanol (C₂H₅OH) can be oxidized to form ethanoic acid (acetic acid, CH₃COOH) using strong oxidizing agents like potassium permanganate (KMnO₄) or potassium dichromate (K₂Cr₂O₇).

Carbon has the ability to form ionic bonds with many elements.

Carbon has a high electronegativity, allowing it to attract many electrons.

Carbon can form stable covalent bonds with other carbon atoms, leading to long chains and rings.

Carbon is abundant in the Earth's crust, making it easy to form compounds.

Correct Answer: C

Solution:

Carbon's ability to form stable covalent bonds with other carbon atoms (catenation) allows it to create long chains and rings, leading to a vast number of compounds.

-COOH

-CHO

-OH

-C=O

Correct Answer: C

Solution:

The functional group present in alcohols is -OH.

1s² 2s² 2p⁶ 3s² 3p⁵

1s² 2s² 2p⁶ 3s² 3p⁶

1s² 2s² 2p⁶ 3s² 3p⁴

1s² 2s² 2p⁶ 3s² 3p³

Correct Answer: A

Solution:

Chlorine has an atomic number of 17, so its electronic configuration is 1s² 2s² 2p⁶ 3s² 3p⁵.

6 covalent bonds

7 covalent bonds

8 covalent bonds

9 covalent bonds

Correct Answer: B

Solution:

Ethane has 7 covalent bonds: 6 C-H bonds and 1 C-C bond.

C₄H₁₀

C₆H₁₂

C₆H₆

C₅H₁₀

Correct Answer: B

Solution:

Cyclohexane has the molecular formula C₆H₁₂ and consists of a ring of six carbon atoms.

Each carbon atom is bonded to four other carbon atoms in a three-dimensional structure.

Each carbon atom is bonded to three other carbon atoms in a planar hexagonal array.

Carbon atoms are arranged in a football shape.

Carbon atoms are arranged in a ring structure.

Correct Answer: B

Solution:

In graphite, each carbon atom is bonded to three other carbon atoms in the same plane, forming a hexagonal array.

Oxidizing agent

Reducing agent

Dehydrating agent

Catalyst

Correct Answer: C

Solution:

Concentrated sulphuric acid acts as a dehydrating agent in the dehydration of ethanol, where it removes water from ethanol to produce ethene.

All members have the same molecular formula.

Successive members differ by a -CH₂- unit.

All members have identical chemical properties.

All members are gases at room temperature.

Correct Answer: B

Solution:

In a homologous series, successive members differ by a -CH₂- unit, and they often have similar chemical properties but not identical molecular formulas.

Correct Answer: B

Solution:

Ethene (C₂H₄) has two carbon atoms double-bonded to each other, with each carbon atom bonded to two hydrogen atoms, making a total of four hydrogen atoms.

Ethane

Ethene

Ethyne

Benzene

Correct Answer: A

Solution:

Ethane is a saturated hydrocarbon because it contains only single bonds between carbon atoms.

Each carbon atom is bonded to three other carbon atoms.

Each carbon atom is bonded to four other carbon atoms in a rigid three-dimensional structure.

Diamond is a good conductor of electricity.

Diamond is formed by layers of hexagonal arrays.

Correct Answer: B

Solution:

In diamond, each carbon atom is bonded to four other carbon atoms, forming a rigid three-dimensional structure.

Addition reaction

Substitution reaction

Elimination reaction

Redox reaction

Correct Answer: B

Solution:

This is a substitution reaction where one hydrogen atom in methane (CH₄) is replaced by a chlorine atom, forming chloromethane (CH₃Cl) and hydrogen chloride (HCl).

Single bond

Double bond

Triple bond

Quadruple bond

Correct Answer: C

Solution:

A nitrogen molecule (N₂) is formed by a triple bond between two nitrogen atoms.

Each carbon atom is bonded to four other carbon atoms.

Graphite is a poor conductor of electricity.

Graphite has a hexagonal array of carbon atoms.

Graphite is the hardest known substance.

Correct Answer: C

Solution:

In graphite, each carbon atom is bonded to three other carbon atoms in the same plane, forming a hexagonal array.

Single bond

Double bond

Triple bond

Ionic bond

Correct Answer: C

Solution:

A nitrogen molecule (N₂) has a triple bond between the two nitrogen atoms.

Ethene (C₂H₄)

Ethyne (C₂H₂)

Propane (C₃H₈)

Benzene (C₆H₆)

Correct Answer: C

Solution:

Propane (C₃H₈) is a saturated hydrocarbon, also known as an alkane, characterized by single bonds between carbon atoms.

Each carbon atom is bonded to four other carbon atoms in a tetrahedral structure.

Each carbon atom is bonded to three other carbon atoms in a planar hexagonal structure.

Graphite is an insulator due to its strong covalent bonds.

Graphite has a three-dimensional network similar to diamond.

Correct Answer: B

Solution:

In graphite, each carbon atom is bonded to three other carbon atoms in a planar hexagonal structure, allowing layers to slide over each other, which makes graphite a good conductor of electricity.

Concentrated hydrochloric acid

Concentrated sulphuric acid

Dilute sulphuric acid

Sodium hydroxide

Correct Answer: B

Solution:

Concentrated sulphuric acid acts as a dehydrating agent in the reaction:

CH_3CH_2OH \xrightarrow{\text{Conc. } H_2SO_4} CH_2=CH_2 + H_2O

Alcohol

Haloalkane

Ketone

Carboxylic acid

Correct Answer: B

Solution:

When a hydrogen atom in a hydrocarbon is replaced by a chlorine atom, the resulting compound is called a haloalkane, specifically a chloroalkane.

Ethanol reacting with sodium

Hydrogenation of vegetable oils

Ethanol oxidizing to ethanoic acid

Substitution of chlorine in methane

Correct Answer: B

Solution:

The hydrogenation of vegetable oils is an addition reaction where unsaturated hydrocarbons add hydrogen in the presence of a catalyst.

Oxidation with KMnO₄

Dehydration with concentrated H₂SO₄

Reduction with Ni catalyst

Hydration with water

Correct Answer: B

Solution:

Ethanol is converted to ethene by dehydration, which involves heating ethanol with concentrated sulphuric acid (H₂SO₄) to remove water.

Isomer

Functional group

Heteroatom

Radical

Correct Answer: C

Solution:

In a hydrocarbon chain, when a hydrogen atom is replaced by another element such as chlorine, the replacing element is referred to as a heteroatom. Heteroatoms confer specific properties to the compound.

High melting and boiling points

Good electrical conductivity

Poor electrical conductivity

Presence of free ions

Correct Answer: C

Solution:

Covalent compounds are generally poor conductors of electricity because they do not have free ions.

Carbon's ability to form ionic bonds.

Carbon's ability to form metallic bonds.

Carbon's tetravalency and catenation.

Carbon's large atomic size.

Correct Answer: C

Solution:

Carbon's tetravalency allows it to form four bonds, and catenation allows it to form long chains and rings.

C₆H₆, C₆H₁₂, C₆H₁₄

CH₄, C₂H₆, C₃H₈

C₂H₄, C₂H₆, C₃H₆

C₄H₁₀, C₅H₁₀, C₆H₁₀

Correct Answer: B

Solution:

A homologous series is a series of compounds with the same functional group and similar chemical properties, differing by a CH₂ unit. CH₄, C₂H₆, C₃H₈ is an example of such a series.

Carbon forms only single bonds with other elements.

Carbon can form double and triple bonds with itself.

Carbon is not found in living organisms.

Carbon compounds are poor conductors of electricity.

Correct Answer: B

Solution:

Carbon can form double and triple bonds with itself, allowing for a variety of structures such as chains and rings.

Functional group

Heteroatom

Isomer

Catalyst

Correct Answer: B

Solution:

In a substitution reaction where a chlorine atom replaces a hydrogen atom in a hydrocarbon chain, the chlorine atom is referred to as a heteroatom. Heteroatoms are elements that replace hydrogen in carbon compounds, providing specific properties to the compound.

CH₄ + Cl₂ → CH₃Cl + HCl

CH₃CH₂OH + Na → CH₃CH₂O⁻Na⁺ + H₂

CH₃CH=CH₂ + H₂ → CH₃CH₂CH₃

2CH₃CH₂OH + O₂ → 2CH₃COOH + 2H₂O

Correct Answer: C

Solution:

The reaction CH₃CH=CH₂ + H₂ → CH₃CH₂CH₃ is an addition reaction where hydrogen is added across the double bond of an alkene to form an alkane.

Its ability to form ionic bonds

Its ability to form covalent bonds

Its ability to form hydrogen bonds

Its ability to form metallic bonds

Correct Answer: B

Solution:

Carbon forms covalent bonds with itself and other elements, allowing it to create a vast number of compounds.

Amino group

Carboxyl group

Hydroxyl group

Carbonyl group

Correct Answer: A

Solution:

The amino group (-NH₂) is known to impart basic properties to a compound because it can accept a proton, making it a base.

Correct Answer: C

Solution:

Cyclohexane (C₆H₁₂) consists of a ring of six carbon atoms, each bonded to two hydrogen atoms, totaling 12 hydrogen atoms in the molecule.

They react vigorously with bromine water.

They are generally unreactive and undergo substitution reactions.

They readily form polymers.

They decolorize potassium permanganate solution.

Correct Answer: B

Solution:

Alkanes are saturated hydrocarbons, making them relatively unreactive. They undergo substitution reactions rather than addition reactions, which are more common for unsaturated hydrocarbons like alkenes and alkynes.

Carboxylic acid

Aldehyde

Ketone

Alcohol

Correct Answer: C

Solution:

Butanone contains the ketone functional group, which is characterized by the carbonyl group (C=O) within the carbon chain.

N₂ has a single bond between nitrogen atoms.

N₂ has a double bond between nitrogen atoms.

N₂ has a triple bond between nitrogen atoms.

N₂ has no bond between nitrogen atoms.

Correct Answer: C

Solution:

A nitrogen molecule (N₂) consists of two nitrogen atoms connected by a triple bond, which involves the sharing of three pairs of electrons between the atoms.

Each carbon atom bonded to three hydrogen atoms

Each carbon atom bonded to four hydrogen atoms

Each carbon atom bonded to two hydrogen atoms

Each carbon atom bonded to one hydrogen atom

Correct Answer: B

Solution:

Methane has the formula CH₄, where the carbon atom is bonded to four hydrogen atoms.

It is an alkene.

It is an alkyne.

It is an alkane.

It is an aromatic compound.

Correct Answer: C

Solution:

C₄H₁₀ is an alkane, specifically butane, which is a saturated hydrocarbon with single bonds only.

CH₃N

CH₂NH

CHN

C₂HN

Correct Answer: C

Solution:

The carbon atom forms a triple bond with nitrogen, using three of its four valencies. The remaining valency is satisfied by one hydrogen atom, resulting in the molecular formula CHN.

It is an alkane.

It is an alkene.

It is an alkyne.

It is a cycloalkane.

Correct Answer: C

Solution:

The molecular formula C₄H₆ corresponds to an alkyne, as alkynes have the general formula CₙH₂ₙ₋₂. In this case, n=4, giving C₄H₆.

CCl₂O

CCl₃O

C₂Cl₂O

C₂Cl₄O

Correct Answer: A

Solution:

The compound consists of one carbon atom forming a double bond with one oxygen atom and two chlorine atoms satisfying the remaining valencies of carbon. Therefore, the molecular formula is CCl₂O.

CH₄ + Cl₂ → CH₃Cl + HCl

C₂H₄ + H₂ → C₂H₆

C₆H₆ + O₂ → CO₂ + H₂O

CH₃CH₂OH → CH₂=CH₂ + H₂O

Correct Answer: A

Solution:

The reaction CH₄ + Cl₂ → CH₃Cl + HCl is a substitution reaction where chlorine replaces a hydrogen atom in methane.

Alcohol (-OH)

Aldehyde (-CHO)

Carboxylic acid (-COOH)

Ketone (-CO-)

Correct Answer: C

Solution:

The carboxylic acid group (-COOH) is responsible for giving the compound acidic properties due to its ability to donate a proton (H⁺) in solution.

Graphite is the hardest known natural material.

Diamond conducts electricity well.

Fullerenes are a type of carbon allotrope.

Graphite has a three-dimensional structure like diamond.

Correct Answer: C

Solution:

Fullerenes are indeed a type of carbon allotrope, characterized by their unique molecular structure, such as C-60, which resembles a football.

One

Two

Three

Four

Correct Answer: C

Solution:

Nitrogen molecules (N₂) have a triple bond between the two nitrogen atoms, which means there are three shared pairs of electrons.

C₄H₁₀

C₆H₁₂

C₆H₆

C₅H₁₀

Correct Answer: B

Solution:

Cyclohexane has the molecular formula C₆H₁₂ and is a cyclic compound.

Aldehydes

Ketones

Alcohols

Carboxylic acids

Correct Answer: C

Solution:

The -OH group is characteristic of alcohols. Alcohols are compounds where a hydroxyl group is bonded to a carbon atom.

Benzene has alternating single and double bonds.

Benzene has a ring structure with delocalized electrons.

Benzene is a straight-chain hydrocarbon.

Benzene contains a triple bond.

Correct Answer: B

Solution:

Benzene has a ring structure with delocalized electrons, which is often represented by a hexagon with a circle inside, indicating resonance.

It is an alkene.

It is an alkyne.

It is an alkane.

It is an aromatic compound.

Correct Answer: C

Solution:

The molecular formula C₅H₁₂ corresponds to an alkane, as it follows the general formula CₙH₂ₙ₊₂ for alkanes. Alkenes and alkynes have fewer hydrogen atoms relative to their carbon atoms.

Isotopes

Polymers

Isomers

Allotropes

Correct Answer: C

Solution:

Compounds with the same molecular formula but different structural arrangements are called isomers.

It forms ethene and water.

It forms ethanoic acid.

It forms methane.

It forms hydrogen gas.

Correct Answer: A

Solution:

Ethanol undergoes dehydration to form ethene and water when heated with concentrated sulphuric acid.

Correct Answer: D

Solution:

Methane (CH₄) consists of one carbon atom bonded to four hydrogen atoms, resulting in four covalent bonds as shown in its electron dot structure.

True or False

Correct Answer: True

Solution:

Carbon atoms can be linked by single, double, or triple bonds, allowing for the formation of various compounds.

Correct Answer: False

Solution:

Methane is a saturated hydrocarbon with single bonds between carbon and hydrogen atoms.

Correct Answer: False

Solution:

Ethanol is soluble in water in all proportions, making it a versatile solvent.

Correct Answer: True

Solution:

Carbon is known for its ability to form covalent bonds with a variety of elements, including hydrogen, oxygen, sulphur, nitrogen, and chlorine, due to its tetravalency and catenation properties.

Correct Answer: False

Solution:

Functional groups confer specific properties to carbon compounds, regardless of the length and nature of the carbon chain.

Correct Answer: True

Solution:

Catenation is the ability of carbon to form long chains by bonding with other carbon atoms. This property is a key reason for the diversity of organic compounds.

Correct Answer: False

Solution:

A molecule of nitrogen (N₂) is connected by a triple bond, not a double bond. This is represented by the structural formula N≡N.

Correct Answer: False

Solution:

Saturated hydrocarbons are fairly unreactive compared to unsaturated hydrocarbons.

Correct Answer: True

Solution:

Catenation is the ability of carbon to form long chains by bonding with other carbon atoms. This property is unique to carbon and allows it to form a vast number of compounds.

Correct Answer: True

Solution:

The conversion of ethanol to ethanoic acid involves the addition of oxygen, which is characteristic of an oxidation reaction.

Correct Answer: True

Solution:

Ethanol is a liquid at room temperature and is soluble in water in all proportions, making it a versatile solvent.

Correct Answer: True

Solution:

Graphite is a good conductor of electricity due to the presence of free electrons in its structure.

Correct Answer: False

Solution:

The earth's crust has only 0.02% carbon in the form of minerals, which is a meagre amount.

Correct Answer: False

Solution:

Graphite is a good conductor of electricity due to the presence of free electrons.

Correct Answer: False

Solution:

Covalent compounds have strong bonds within the molecule, but weak intermolecular forces, resulting in low melting and boiling points.

Correct Answer: True

Solution:

Carbon can form compounds containing double and triple bonds, which leads to the formation of various structures like straight chains, branched chains, or rings.

Correct Answer: True

Solution:

Ethanol is a good solvent and is used in medicines such as tincture iodine and cough syrups.

Correct Answer: False

Solution:

Graphite and diamond have very different physical properties due to the different ways carbon atoms are bonded in each structure.

Correct Answer: False

Solution:

Ethanol is soluble in water in all proportions.

Correct Answer: True

Solution:

Ethanol is oxidized to ethanoic acid in the presence of oxidizing agents such as acidified potassium dichromate.

Correct Answer: True

Solution:

Covalent bonds are formed by the sharing of electrons between two atoms so that both can achieve a completely filled outermost shell.

Correct Answer: True

Solution:

Carbon forms covalent bonds by sharing electrons with other atoms, including other carbon atoms, which allows it to form a wide variety of compounds.

Correct Answer: False

Solution:

Methanol is toxic, and even small quantities can cause serious harm, including blindness or death.

Correct Answer: True

Solution:

Carbon's ability to form covalent bonds with itself and various other elements allows it to create a diverse array of compounds.

Correct Answer: True

Solution:

Carbon can form compounds with double and triple bonds, which are known as unsaturated compounds.

Correct Answer: True

Solution:

Methane, with the formula CH₄, is a simple carbon compound and is a major component of bio-gas and Compressed Natural Gas (CNG), making it widely used as a fuel.

Correct Answer: True

Solution:

Carbon has the ability to form chains of varying lengths, including straight and branched chains, due to its property of catenation.

Correct Answer: True

Solution:

Graphite's structure allows electrons to move freely between layers, making it a good conductor of electricity.

Correct Answer: True

Solution:

Ethanol is a liquid at room temperature and is soluble in water in all proportions.

Correct Answer: True

Solution:

Carbon has the unique ability to form bonds with other atoms of carbon, giving rise to large molecules. This property is called catenation.

Correct Answer: False

Solution:

Carbon can form compounds with single, double, and triple bonds.

Correct Answer: False

Solution:

Saturated hydrocarbons are generally less reactive than unsaturated hydrocarbons, which contain double or triple bonds that are more reactive.

Correct Answer: False

Solution:

Covalent compounds are generally poor conductors of electricity because they do not form charged particles.

Correct Answer: True

Solution:

Heating ethanol with concentrated sulphuric acid results in dehydration, producing ethene and water.

Correct Answer: True

Solution:

The earth's crust contains a small amount of carbon, specifically 0.02%, in the form of minerals such as carbonates and hydrogen-carbonates.

Correct Answer: False

Solution:

Graphite is actually a good conductor of electricity due to its structure, where each carbon atom is bonded to three others in layers, allowing electrons to move freely.

Correct Answer: True

Solution:

Saturated hydrocarbons, also known as alkanes, contain only single bonds between carbon atoms.

Correct Answer: True

Solution:

Methane has a formula CH₄, where carbon shares electrons with four hydrogen atoms.

Carbon and its Compounds

AI Learning Assistant

CBSE Learning Objectives – Key Concepts & Skills You Must Know

Learning Objectives

CBSE Revision Notes & Quick Summary for Last-Minute Study

Chapter 4: Carbon and its Compounds

Introduction

Importance of Carbon

4.1 Bonding in Carbon - The Covalent Bond

4.2 Versatile Nature of Carbon

4.2.1 Saturated and Unsaturated Carbon Compounds

4.2.2 Homologous Series

4.2.3 Nomenclature of Carbon Compounds

Table 4.4: Nomenclature of Organic Compounds

Conclusion

CBSE Exam Tips, Important Questions & Common Mistakes to Avoid

Common Mistakes and Exam Tips

Common Pitfalls

Tips for Success

Multiple Choice Questions

Q1.What is the result of adding hydrogen to unsaturated hydrocarbons in the presence of a nickel catalyst?

Correct Answer: B

Q2.In a laboratory, a student accidentally mixed a solution of ethanoic acid with ethanol and added a few drops of concentrated sulfuric acid. What is the main product of this reaction?

Correct Answer: A

Q3.In a laboratory experiment, ethanol is heated with excess concentrated sulfuric acid at 443 K. What is the main product of this reaction?

Correct Answer: B

Q4.Which of the following statements is true about the bonding in carbon?

Correct Answer: B

Q5.Which of the following is an example of a substitution reaction?

Correct Answer: C

Q6.Which of the following is a property of ethanol?

Correct Answer: C

Q7.Which of the following functional groups is present in butanone?

Correct Answer: C

Q8.Ethanol reacts with sodium to form sodium ethoxide and hydrogen gas. If 46 grams of ethanol (C₂H₅OH) completely reacts with sodium, how many grams of hydrogen gas are produced? (Atomic masses: C = 12 u, H = 1 u, O = 16 u, Na = 23 u)

Correct Answer: B

Q9.What is the main reason for the versatility of carbon in forming a large number of compounds?

Correct Answer: C

Q10.In a laboratory experiment, a student replaces one hydrogen atom in methane (CH₄) with a chlorine atom. What type of compound is formed?

Correct Answer: B

Q11.Which of the following is a property of covalent compounds?

Correct Answer: C

Q12.What is the primary reason carbon can form a vast number of compounds?

Correct Answer: C

Q13.What happens when ethanol reacts with sodium?

Correct Answer: B

Q14.What is the structural formula of a molecule that has a triple bond between two nitrogen atoms?

Correct Answer: C

Q15.Which of the following processes is used to convert ethanol into ethene?

Correct Answer: B

Q16.Which of the following compounds can undergo an oxidation reaction to form a carboxylic acid?

Correct Answer: B

Q17.Which of the following statements best explains why carbon is able to form a vast number of compounds?

Correct Answer: C

Q18.Which of the following functional groups is present in alcohols?

Correct Answer: C

Q19.What is the electronic configuration of chlorine?

Correct Answer: A

Q20.How many covalent bonds are present in a molecule of ethane (C₂H₆)?

Correct Answer: B

Q21.What is the structural formula of cyclohexane?

Correct Answer: B

Q22.Which of the following best describes the structure of graphite?

Correct Answer: B

Q23.Which of the following best describes the role of concentrated sulphuric acid in the dehydration of ethanol?

Correct Answer: C

Q24.Which of the following is a characteristic of a homologous series?

Correct Answer: B

Q25.A student is asked to draw the electron dot structure of a molecule of ethene. How many hydrogen atoms should be shown in the structure?

Correct Answer: B

Q26.Which of the following compounds is an example of a saturated hydrocarbon?

Correct Answer: A

Q27.Which of the following statements is true about the structure of diamond?

Correct Answer: B

Q28.Consider the following reaction: CH₄ + Cl₂ → CH₃Cl + HCl. What type of reaction is this?

Correct Answer: B

Q29.What type of bond is formed between two nitrogen atoms in a nitrogen molecule?

Correct Answer: C

Q30.Which of the following statements is true about the structure of graphite?

Correct Answer: C