71. Which of the following compounds is a strong nucleophile?
a) Toluene
b) Phenol
c) Acetylene
d) Benzene
Answer: b) Phenol
Explanation: Phenol can act as a strong nucleophile due to the availability of the lone pair on the oxygen atom of the hydroxyl group.
72. Which of the following is the major product when 1-hexene undergoes hydroboration-oxidation?
a) 1-Hexanol
b) 2-Hexanol
c) 3-Hexanol
d) Hexanal
Answer: b) 2-Hexanol
Explanation: The hydroboration-oxidation of 1-hexene results in the formation of 2-hexanol, following Markovnikov’s rule.
73. Which of the following is not an aromatic compound?
a) Naphthalene
b) Toluene
c) Cyclohexane
d) Anisole
Answer: c) Cyclohexane
Explanation: Cyclohexane is a saturated compound with no aromatic properties, while naphthalene, toluene, and anisole are all aromatic.
74. What is the functional group of esters?
a) Carbonyl
b) Hydroxyl
c) Carboxyl
d) Alkoxy
Answer: a) Carbonyl
Explanation: The functional group of esters contains a carbonyl group (C=O) bonded to an alkoxy group (R-O).
75. Which of the following compounds has the highest reactivity towards electrophilic substitution?
a) Benzene
b) Toluene
c) Nitrobenzene
d) Aniline
Answer: d) Aniline
Explanation: Aniline is highly reactive in electrophilic substitution due to the electron-donating amino group (-NH₂), which enhances the electron density on the aromatic ring.
76. Which of the following is a common method for producing alkenes?
a) Hydrogenation
b) Dehydrohalogenation
c) Hydration
d) Hydrohalogenation
Answer: b) Dehydrohalogenation
Explanation: Dehydrohalogenation involves the elimination of a hydrogen halide from alkyl halides to form alkenes.
77. What is the major product when 1-pentene reacts with HBr?
a) 1-Bromopentane
b) 2-Bromopentane
c) 3-Bromopentane
d) 4-Bromopentane
Answer: b) 2-Bromopentane
Explanation: The addition of HBr to 1-pentene follows Markovnikov’s rule, resulting in 2-bromopentane as the major product.
78. Which of the following compounds is least soluble in water?
a) Ethanol
b) 1-Butanol
c) Pentane
d) 2-Pentanol
Answer: c) Pentane
Explanation: Pentane is least soluble in water due to its non-polar nature, while the other alcohols are polar and more soluble.
79. Which of the following compounds is the least reactive in electrophilic aromatic substitution?
a) Toluene
b) Nitrobenzene
c) Aniline
d) Benzene
Answer: b) Nitrobenzene
Explanation: Nitrobenzene is least reactive due to the electron-withdrawing nitro group, which decreases the electron density of the aromatic ring, making it less susceptible to electrophilic attack.
80. What is the main product of the oxidation of primary alcohols?
a) Aldehydes
b) Ketones
c) Carboxylic acids
d) Alcohols
Answer: c) Carboxylic acids
Explanation: Primary alcohols are oxidized to form carboxylic acids upon complete oxidation.
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