61. What type of reaction occurs when an alkane is treated with bromine in the presence of light?
a) Substitution
b) Addition
c) Elimination
d) Polymerization
Answer: a) Substitution
Explanation: The reaction of an alkane with bromine in the presence of light leads to substitution, where a hydrogen atom is replaced by a bromine atom.
62. Which of the following compounds has a -OH group?
a) Benzene
b) Ethylene
c) Phenol
d) Cyclopropane
Answer: c) Phenol
Explanation: Phenol contains a -OH (hydroxyl) group attached to a benzene ring, making it an aromatic alcohol.
63. Which of the following is an example of a primary alcohol?
a) 2-Butanol
b) 1-Butanol
c) Isopropanol
d) 2-Pentanol
Answer: b) 1-Butanol
Explanation: 1-Butanol is a primary alcohol, as the hydroxyl (-OH) group is attached to a carbon atom that is connected to only one other carbon.
64. Which of the following compounds cannot undergo addition reactions?
a) 1-Butene
b) 2-Butyne
c) Benzene
d) Propylene
Answer: c) Benzene
Explanation: Benzene does not undergo addition reactions due to its stable aromatic structure; it undergoes electrophilic substitution instead.
65. What is the IUPAC name of the compound C₃H₆?
a) Propylene
b) Propane
c) Propyn
d) Butene
Answer: a) Propylene
Explanation: The compound with the formula C₃H₆ is propylene, an alkene with a double bond.
66. What is the main functional group present in aldehydes?
a) Carbonyl group
b) Hydroxyl group
c) Carboxyl group
d) Ether group
Answer: a) Carbonyl group
Explanation: The main functional group in aldehydes is the carbonyl group (C=O), with at least one hydrogen atom attached to the carbonyl carbon.
67. What is the primary product when benzene is treated with chlorine in the presence of iron chloride?
a) Chlorobenzene
b) Benzyl chloride
c) Dichlorobenzene
d) Phenol
Answer: a) Chlorobenzene
Explanation: The reaction of benzene with chlorine in the presence of iron chloride produces chlorobenzene via electrophilic aromatic substitution.
68. Which of the following compounds has a higher boiling point?
a) Butane
b) 1-Butene
c) 2-Butene
d) 1-Butyne
Answer: d) 1-Butyne
Explanation: 1-Butyne has a higher boiling point than butane and the butenes due to the presence of a triple bond, which contributes to stronger intermolecular forces.
69. What is the IUPAC name of the compound with the formula C₆H₅-CH₂OH?
a) Phenol
b) Benzyl alcohol
c) Benzoic acid
d) Toluene
Answer: b) Benzyl alcohol
Explanation: The compound C₆H₅-CH₂OH is named benzyl alcohol, which consists of a benzene ring attached to a CH₂OH group.
70. Which of the following is a characteristic of alkenes?
a) They contain only single bonds.
b) They can undergo addition reactions.
c) They are saturated hydrocarbons.
d) They have a higher boiling point than alkanes.
Answer: b) They can undergo addition reactions.
Explanation: Alkenes are characterized by their ability to undergo addition reactions due to the presence of at least one double bond.
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