Question 1

In the reaction of ethanol with sodium, what is the gas evolved?

Accepted Answer

Correct Option: B. Solution: When ethanol reacts with sodium, hydrogen gas ($H_2$) is evolved as a byproduct of the formation of sodium ethoxide.

Question 2

Which of the following statements correctly describes the property of catenation in carbon compounds?

Accepted Answer

Correct Option: A. Solution: Catenation is the ability of carbon to form long chains, branched chains, and rings due to the strong carbon-carbon bonds.

Question 3

Which of the following best explains why carbon forms a vast number of compounds compared to silicon, even though both are in the same group in the periodic table?

Accepted Answer

Correct Option: A. Solution: Carbon forms a vast number of compounds because its smaller atomic size allows it to form strong covalent bonds with other carbon atoms, a property known as catenation. This is not as prominent in silicon due to its larger atomic size, which weakens the bonds.

Question 4

A student is conducting an experiment to observe the cleaning action of soap. They add soap to a test tube containing oil and water and shake it. Which of the following best describes the mechanism that allows soap to clean the oil effectively?

Accepted Answer

Correct Option: B. Solution: Soap molecules form micelles where the hydrophobic tails face inward towards the oil, allowing the oil to be emulsified and washed away.

Question 5

Which of the following hydrocarbons is classified as an unsaturated hydrocarbon due to the presence of a double bond?

Accepted Answer

Correct Option: C. Solution: Ethene ($C_2H_4$) is classified as an unsaturated hydrocarbon because it contains a double bond between the carbon atoms, whereas methane, ethane, and propane are saturated hydrocarbons with only single bonds.

Question 6

In the hydrogenation of vegetable oils, which catalyst is commonly used to convert unsaturated hydrocarbons to saturated hydrocarbons?

Accepted Answer

Correct Option: C. Solution: Nickel is commonly used as a catalyst in the hydrogenation of vegetable oils to convert unsaturated hydrocarbons to saturated hydrocarbons.

Question 7

Which of the following functional groups is present in carboxylic acids?

Accepted Answer

Correct Option: C. Solution: Carboxylic acids contain the carboxyl group ($-COOH$), which is responsible for their acidic properties.

Question 8

What is the suffix used for naming alcohols in the nomenclature of carbon compounds?

Accepted Answer

Correct Option: B. Solution: The suffix '-ol' is used for naming alcohols, as seen in compounds like methanol and ethanol.

Question 9

Which reaction demonstrates the dehydration of ethanol to form ethene?

Accepted Answer

Correct Option: A. Solution: The dehydration of ethanol to form ethene involves heating ethanol with concentrated sulfuric acid, which acts as a dehydrating agent.

Question 10

A compound has the molecular formula $C_3H_6O$. It is known to be a ketone. What is the IUPAC name of this compound?

Accepted Answer

Correct Option: B. Solution: The compound $C_3H_6O$ is a ketone, which means it has a carbonyl group ($C=O$) bonded to two carbon atoms. The IUPAC name for this ketone is 'Propanone'.

Question 11

What is the main difference in the properties of saturated and unsaturated hydrocarbons?

Accepted Answer

Correct Option: B. Solution: Unsaturated hydrocarbons contain double or triple bonds, making them more reactive than saturated hydrocarbons, which only have single bonds.

Question 12

Which of the following reactions demonstrates the acidic nature of ethanoic acid?

Accepted Answer

Correct Option: A. Solution: Ethanoic acid reacts with sodium carbonate to produce carbon dioxide, water, and sodium acetate: $$2CH_3COOH + Na_2CO_3 \rightarrow 2CH_3COONa + H_2O + CO_2$$. This reaction demonstrates its acidic nature.

Question 13

In a laboratory experiment, a student heats ethanol with concentrated sulfuric acid at 443 K. What is the major product formed?

Accepted Answer

Correct Option: B. Solution: When ethanol is heated with concentrated sulfuric acid at 443 K, it undergoes dehydration to form ethene: $$CH_3CH_2OH \xrightarrow{H_2SO_4, 443 K} CH_2=CH_2 + H_2O$$.

Question 14

Which of the following compounds is an example of a molecule with a triple bond between carbon atoms?

Accepted Answer

Correct Option: C. Solution: Ethyne ($C_2H_2$) has a triple bond between the two carbon atoms.

Question 15

Which of the following reactions is an example of a substitution reaction involving a hydrocarbon?

Accepted Answer

Correct Option: A. Solution: The reaction $CH_4 + Cl_2 \rightarrow CH_3Cl + HCl$ is a substitution reaction where chlorine replaces a hydrogen atom in methane.

Question 16

Which of the following reactions is an example of a substitution reaction involving a carbon compound?

Accepted Answer

Correct Option: A. Solution: The reaction $$CH_4 + Cl_2 \rightarrow CH_3Cl + HCl$$ is a substitution reaction where chlorine replaces hydrogen in methane.

Question 17

Which of the following compounds is an example of a structural isomer of butane?

Accepted Answer

Correct Option: B. Solution: Isobutane is a structural isomer of butane, having the same molecular formula $C_4H_{10}$ but a different arrangement of atoms.

Question 18

Which of the following statements is true regarding the effectiveness of detergents in hard water compared to soaps?

Accepted Answer

Correct Option: B. Solution: Detergents are generally sodium salts of sulphonic acids or ammonium salts with chlorides or bromides ions, which do not form insoluble precipitates with the calcium and magnesium ions in hard water, thus remaining effective.

Question 19

Which of the following compounds is an example of an alkene?

Accepted Answer

Correct Option: B. Solution: Propene ($C_3H_6$) is an alkene, characterized by the presence of a double bond between carbon atoms.

Question 20

Which of the following statements best describes the structural isomerism in butane?

Accepted Answer

Correct Option: A. Solution: Structural isomerism in butane arises because it can form a straight chain (n-butane) and a branched chain (isobutane), both having the molecular formula $C_4H_{10}$ but different structures.

Question 21

Which of the following statements correctly describes the property of catenation in carbon compounds?

Accepted Answer

Correct Option: B. Solution: Catenation is the property of carbon that allows it to form long chains, branched chains, and rings with other carbon atoms, leading to a vast number of organic compounds.

Question 22

What is the difference in molecular formula between successive members of a homologous series of alkanes?

Accepted Answer

Correct Option: B. Solution: In a homologous series of alkanes, each successive member differs by a $-CH_2$ unit.

Question 23

Which of the following statements correctly describes the structural difference between diamond and graphite, two allotropes of carbon?

Accepted Answer

Correct Option: B. Solution: Diamond is composed of carbon atoms each bonded to four other carbon atoms in a three-dimensional network, making it extremely hard. Graphite, on the other hand, consists of layers of carbon atoms bonded in a hexagonal array, and these layers can slide over each other, making graphite slippery and a good conductor of electricity.

Question 24

What is the primary reason graphite is a good conductor of electricity?

Accepted Answer

Correct Option: B. Solution: Graphite is a good conductor of electricity because each carbon atom is bonded to three others, leaving one electron free to move, which allows for electrical conductivity.

Question 25

Which of the following is a characteristic property of carboxylic acids like ethanoic acid?

Accepted Answer

Correct Option: B. Solution: Carboxylic acids, such as ethanoic acid, are weak acids and do not completely ionize in water, unlike strong mineral acids.

Question 26

Why are carbon compounds generally poor conductors of electricity?

Accepted Answer

Correct Option: C. Solution: Carbon compounds are generally poor conductors of electricity because they do not form ions.

Question 27

Consider the reaction: $$C_2H_4 + H_2 \xrightarrow{	ext{Ni catalyst}} C_2H_6$$. What type of reaction is this, and what is the role of the nickel catalyst?

Accepted Answer

Correct Option: B. Solution: This is an addition reaction where hydrogen is added across the double bond of ethene to form ethane. The nickel catalyst facilitates this process by providing a surface for the reaction to occur, allowing the hydrogen molecules to adsorb and react with the ethene.

Question 28

Which of the following hydrocarbons is classified as a saturated hydrocarbon?

Accepted Answer

Correct Option: C. Solution: Ethane ($C_2H_6$) is a saturated hydrocarbon because it contains only single bonds between carbon atoms.

Question 29

In the context of organic chemistry, what is the significance of the carbon-carbon bond strength?

Accepted Answer

Correct Option: C. Solution: The strength of the carbon-carbon bond is significant because it leads to the stability of carbon compounds, allowing for extensive catenation and the formation of a large number of stable compounds.

Question 30

What is the primary product formed when ethanol is oxidized using alkaline potassium permanganate?

Accepted Answer

Correct Option: B. Solution: Ethanol is oxidized to ethanoic acid ($CH_3COOH$) using alkaline potassium permanganate.

Question 31

Ethanol reacts with sodium to form sodium ethoxide and hydrogen gas. If 46 grams of ethanol ($C_2H_5OH$) react with excess sodium, how many grams of hydrogen gas ($H_2$) will be produced?

Accepted Answer

Correct Option: B. Solution: The balanced equation for the reaction is $$2C_2H_5OH + 2Na \rightarrow 2C_2H_5ONa + H_2$$. The molar mass of ethanol is 46 g/mol, and for $H_2$ it is 2 g/mol. From the equation, 2 moles of ethanol produce 1 mole of $H_2$. Thus, 46 g of ethanol (1 mole) will produce 1 g of $H_2$.

Question 32

In the hydrogenation of vegetable oils, which catalyst is commonly used to convert unsaturated hydrocarbons to saturated hydrocarbons?

Accepted Answer

Correct Option: C. Solution: Nickel is commonly used as a catalyst in the hydrogenation of vegetable oils to convert unsaturated hydrocarbons to saturated hydrocarbons.

Question 33

What type of bond is formed when carbon shares its electrons with other atoms to achieve a noble gas configuration?

Accepted Answer

Correct Option: B. Solution: Carbon forms covalent bonds by sharing electrons with other atoms to achieve a noble gas configuration.

Question 34

Consider a carbon compound with the molecular formula $C_4H_8$. If it is an alkene, what would be the IUPAC name of this compound?

Accepted Answer

Correct Option: B. Solution: The compound $C_4H_8$ is an alkene, which means it contains a double bond. The IUPAC name for an alkene with four carbon atoms is 'Butene'.

Question 35

Which functional group is responsible for the acidic properties of ethanoic acid?

Accepted Answer

Correct Option: C. Solution: The carboxyl group ($-COOH$) is responsible for the acidic properties of ethanoic acid, as it can donate a proton ($H^+$) in solution.

Question 36

Which of the following statements is true about saturated hydrocarbons?

Accepted Answer

Correct Option: A. Solution: Saturated hydrocarbons contain only single bonds between carbon atoms, making them less reactive than unsaturated hydrocarbons.

Question 37

Which property of carbon allows it to form a vast number of compounds?

Accepted Answer

Correct Option: C. Solution: Carbon can form a large number of compounds due to its ability to catenate (form chains with other carbon atoms) and its tetravalency (ability to form four covalent bonds).

Question 38

Which of the following compounds is most likely to undergo an addition reaction with hydrogen in the presence of a nickel catalyst?

Accepted Answer

Correct Option: C. Solution: Ethene ($C_2H_4$) is an unsaturated hydrocarbon with a double bond, making it reactive to addition reactions with hydrogen in the presence of a nickel catalyst.

Question 39

In the context of carbon compounds, what is the primary reason for the formation of a homologous series?

Accepted Answer

Correct Option: B. Solution: A homologous series is formed due to the ability of carbon to create chains of varying lengths and incorporate different functional groups, which impart similar chemical properties to the compounds.

Question 40

Consider a scenario where a cleaning agent is used in hard water. Which of the following statements best explains why detergents are more effective than soaps in such conditions?

Accepted Answer

Correct Option: B. Solution: Detergents are more effective in hard water because their charged ends do not form insoluble precipitates with calcium and magnesium ions, unlike soaps.

Question 41

Which of the following statements correctly describes the structure of diamond?

Accepted Answer

Correct Option: B. Solution: In diamond, each carbon atom is bonded to four other carbon atoms forming a rigid three-dimensional structure, making it the hardest known natural material.

Question 42

Why do soaps form micelles in water but not in ethanol?

Accepted Answer

Correct Option: B. Solution: Micelle formation occurs in water because it is a polar solvent, which allows the hydrophilic ends of soap molecules to interact with water, while the hydrophobic tails trap dirt.

Question 43

Consider a molecule of ethyne ($C_2H_2$). How many covalent bonds are present in this molecule?

Accepted Answer

Correct Option: C. Solution: Ethyne ($C_2H_2$) consists of two carbon atoms connected by a triple bond and each carbon atom is bonded to one hydrogen atom. This results in a total of 5 covalent bonds: 1 single bond between each carbon and hydrogen, and 1 triple bond between the carbon atoms.

Question 44

What is the primary mechanism by which soaps clean surfaces?

Accepted Answer

Correct Option: B. Solution: Soaps clean by forming micelles, where the hydrophobic tails trap dirt and grease, and the hydrophilic heads interact with water, allowing the dirt to be washed away.

Question 45

What is the general formula for alkenes, and how does it relate to the number of carbon atoms?

Accepted Answer

Correct Option: B. Solution: The general formula for alkenes is $C_nH_{2n}$, where $n$ represents the number of carbon atoms, indicating that alkenes have a double bond.

Question 46

In the context of organic chemistry, what is the significance of the property of catenation in carbon?

Accepted Answer

Correct Option: B. Solution: Catenation is the ability of carbon to form long chains and rings by bonding with other carbon atoms. This property is significant because it leads to the formation of a vast diversity of organic compounds, including both saturated and unsaturated hydrocarbons.

Question 47

What is the boiling point of ethanol ($CH_3CH_2OH$) as given in the text?

Accepted Answer

Correct Option: B. Solution: The boiling point of ethanol is 351 K as mentioned in the table of melting and boiling points of carbon compounds.

Question 48

The property of catenation allows carbon to form compounds with long chains, branched chains, and rings.

Accepted Answer

Answer: True. Solution: Catenation is the ability of carbon to form bonds with other carbon atoms, resulting in long chains, branched chains, and rings. This property is unique to carbon to a large extent and is responsible for the vast number of organic compounds.

Question 49

Ethanoic acid is a strong acid that completely ionizes in water.

Accepted Answer

Answer: False. Solution: Ethanoic acid is a weak acid and does not completely ionize in water, unlike strong acids such as hydrochloric acid.

Question 50

In a homologous series, the chemical properties of the compounds vary significantly due to differences in the length of the carbon chain.

Accepted Answer

Answer: False. Solution: In a homologous series, the chemical properties remain similar because they are determined by the functional group, not the length of the carbon chain.

Question 51

Carbon forms covalent bonds by sharing electrons to achieve a noble gas configuration.

Accepted Answer

Answer: True. Solution: Carbon shares its valence electrons with other atoms to achieve a stable electronic configuration similar to that of noble gases.

Question 52

The cleaning action of soap involves the formation of micelles, where the hydrophobic tails of soap molecules encapsulate oil droplets, allowing them to be washed away with water.

Accepted Answer

Answer: True. Solution: Soap molecules have a hydrophobic tail and a hydrophilic head. In water, they form micelles with the hydrophobic tails surrounding the oil, allowing the oil to be emulsified and rinsed away.

Question 53

Graphite is a poor conductor of electricity due to its structure.

Accepted Answer

Answer: False. Solution: Graphite is actually a good conductor of electricity because its structure allows free movement of electrons between layers.

Question 54

Carbon exhibits the property of catenation, which allows it to form long chains, branched chains, and rings.

Accepted Answer

Answer: True. Solution: Catenation is the ability of carbon to form bonds with other carbon atoms, leading to a variety of structures such as long chains, branched chains, and rings.

Question 55

Butane and isobutane are structural isomers with the same molecular formula $C_4H_{10}$.

Accepted Answer

Answer: True. Solution: Structural isomers have the same molecular formula but different structures. Butane and isobutane both have the formula $C_4H_{10}$ but differ in the arrangement of their carbon atoms.

Question 56

Carbon can form single, double, and triple covalent bonds by sharing electrons with other atoms.

Accepted Answer

Answer: True. Solution: Carbon has four valence electrons and can share these electrons with other atoms to form single, double, or triple covalent bonds, achieving a noble gas configuration.

Question 57

Carbon can form only single covalent bonds with other atoms.

Accepted Answer

Answer: False. Solution: Carbon can form single, double, and triple covalent bonds with other atoms, allowing for a variety of molecular structures.

Question 58

Unsaturated hydrocarbons are generally more reactive than saturated hydrocarbons due to the presence of double or triple bonds.

Accepted Answer

Answer: True. Solution: Unsaturated hydrocarbons contain double or triple bonds, which are more reactive than the single bonds found in saturated hydrocarbons. This increased reactivity is due to the higher energy and instability of multiple bonds.

Question 59

Ethanoic acid is a strong acid that completely ionizes in water.

Accepted Answer

Answer: False. Solution: Ethanoic acid is a weak acid and does not completely ionize in water. It is less ionized compared to strong acids like hydrochloric acid.

Question 60

Ethanol reacts with sodium to form sodium ethoxide and hydrogen gas.

Accepted Answer

Answer: True. Solution: Ethanol reacts with sodium to produce sodium ethoxide and hydrogen gas, as shown in the reaction: $$2Na + 2CH_3CH_2OH \rightarrow 2CH_3CH_2O^-Na^+ + H_2$$.

Question 61

Structural isomers have the same molecular formula but different structures.

Accepted Answer

Answer: True. Solution: Structural isomers are compounds with the same molecular formula but different structural arrangements of atoms.

Question 62

Carbon compounds can only form single covalent bonds between carbon atoms.

Accepted Answer

Answer: False. Solution: Carbon compounds can form single, double, and triple covalent bonds between carbon atoms, as seen in alkanes, alkenes, and alkynes respectively.

Question 63

In a homologous series, the chemical properties of compounds are determined by the functional group, regardless of the length of the carbon chain.

Accepted Answer

Answer: True. Solution: The chemical properties of compounds in a homologous series are determined by the functional group, which remains consistent across the series, while the physical properties may vary with the length of the carbon chain.

Question 64

Covalent compounds of carbon generally have high melting and boiling points due to strong intermolecular forces.

Accepted Answer

Answer: False. Solution: Covalent compounds of carbon generally have low melting and boiling points because the intermolecular forces are weak, despite strong covalent bonds within the molecules.

Carbon and its Compounds

Learning Objectives

Learning Objectives

Revision Notes & Summary

Chapter Notes

Covalent Bonding in Carbon

Allotropes of Carbon

Catenation and Carbon Compounds

Functional Groups and Homologous Series

Chemical Reactions of Carbon Compounds

Properties and Reactions of Ethanol and Ethanoic Acid

Mechanism of Soap and Detergent Action

Saturated and Unsaturated Hydrocarbons

Chains, Branches, Rings and Isomerism

Nomenclature of Carbon Compounds

Soaps, Detergents and Hard Water

Exam Tips & Common Mistakes

Common Mistakes & Exam Tips

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Multiple Choice Questions

Q1.In the reaction of ethanol with sodium, what is the gas evolved?

Correct Answer: B

Q2.Which of the following statements correctly describes the property of catenation in carbon compounds?

Correct Answer: A

Q3.Which of the following best explains why carbon forms a vast number of compounds compared to silicon, even though both are in the same group in the periodic table?

Correct Answer: A

Q4.A student is conducting an experiment to observe the cleaning action of soap. They add soap to a test tube containing oil and water and shake it. Which of the following best describes the mechanism that allows soap to clean the oil effectively?

Correct Answer: B

Q5.Which of the following hydrocarbons is classified as an unsaturated hydrocarbon due to the presence of a double bond?

Correct Answer: C

Q6.In the hydrogenation of vegetable oils, which catalyst is commonly used to convert unsaturated hydrocarbons to saturated hydrocarbons?

Correct Answer: C

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

Correct Answer: C

Q8.What is the suffix used for naming alcohols in the nomenclature of carbon compounds?

Correct Answer: B

Q9.Which reaction demonstrates the dehydration of ethanol to form ethene?

Correct Answer: A

Q10.A compound has the molecular formula C3H6OC_3H_6OC3​H6​O. It is known to be a ketone. What is the IUPAC name of this compound?

Correct Answer: B

Q11.What is the main difference in the properties of saturated and unsaturated hydrocarbons?

Correct Answer: B

Q12.Which of the following reactions demonstrates the acidic nature of ethanoic acid?

Correct Answer: A

Q13.In a laboratory experiment, a student heats ethanol with concentrated sulfuric acid at 443 K. What is the major product formed?

Correct Answer: B

Q14.Which of the following compounds is an example of a molecule with a triple bond between carbon atoms?

Correct Answer: C

Q15.Which of the following reactions is an example of a substitution reaction involving a hydrocarbon?

Correct Answer: A

Q16.Which of the following reactions is an example of a substitution reaction involving a carbon compound?

Correct Answer: A

Q17.Which of the following compounds is an example of a structural isomer of butane?

Correct Answer: B

Q18.Which of the following statements is true regarding the effectiveness of detergents in hard water compared to soaps?

Correct Answer: B

Q19.Which of the following compounds is an example of an alkene?

Correct Answer: B

Q20.Which of the following statements best describes the structural isomerism in butane?

Correct Answer: A

Q21.Which of the following statements correctly describes the property of catenation in carbon compounds?

Correct Answer: B

Q22.What is the difference in molecular formula between successive members of a homologous series of alkanes?

Correct Answer: B

Q23.Which of the following statements correctly describes the structural difference between diamond and graphite, two allotropes of carbon?

Correct Answer: B

Q24.What is the primary reason graphite is a good conductor of electricity?

Correct Answer: B

Q25.Which of the following is a characteristic property of carboxylic acids like ethanoic acid?

Correct Answer: B

Q26.Why are carbon compounds generally poor conductors of electricity?

Correct Answer: C

Q27.Consider the reaction: C2H4+H2→Ni catalystC2H6C_2H_4 + H_2 \xrightarrow{\text{Ni catalyst}} C_2H_6C2​H4​+H2​Ni catalyst​C2​H6​. What type of reaction is this, and what is the role of the nickel catalyst?

Correct Answer: B