Q. What type of reaction occurs when an alcohol is oxidized? (2023)
-
A.
Reduction
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B.
Dehydration
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C.
Substitution
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D.
Oxidation
Solution
Oxidation of alcohols involves the loss of hydrogen or the gain of oxygen, leading to the formation of aldehydes, ketones, or carboxylic acids.
Correct Answer: D — Oxidation
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Q. What type of reaction occurs when phenol reacts with bromine? (2023)
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A.
Electrophilic substitution
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B.
Nucleophilic substitution
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C.
Addition
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D.
Elimination
Solution
Phenol undergoes electrophilic substitution when it reacts with bromine, resulting in brominated phenols.
Correct Answer: A — Electrophilic substitution
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Q. Which of the following alcohols is most soluble in water? (2022)
-
A.
1-butanol
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B.
2-butanol
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C.
3-butanol
-
D.
Cyclohexanol
Solution
2-butanol has a higher solubility in water due to its ability to form hydrogen bonds more effectively than the others.
Correct Answer: B — 2-butanol
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Q. Which of the following is a characteristic of ethers? (2019)
-
A.
Higher boiling point than alcohols
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B.
Lower boiling point than alcohols
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C.
Soluble in water
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D.
Flammable
Solution
Ethers generally have lower boiling points than alcohols due to the absence of hydrogen bonding.
Correct Answer: B — Lower boiling point than alcohols
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Q. Which of the following is a characteristic property of ethers? (2019)
-
A.
High boiling point
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B.
Solubility in water
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C.
Low reactivity
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D.
Acidic nature
Solution
Ethers are generally low in reactivity compared to alcohols and phenols, making them stable compounds.
Correct Answer: C — Low reactivity
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Q. Which of the following is a method for the preparation of alcohols? (2022)
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A.
Hydrolysis of alkyl halides
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B.
Oxidation of alkenes
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C.
Reduction of ketones
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D.
All of the above
Solution
All of the mentioned methods can be used to prepare alcohols.
Correct Answer: D — All of the above
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Q. Which of the following is a property of ethers? (2020)
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A.
High boiling point
-
B.
Soluble in water
-
C.
Flammable
-
D.
Non-polar
Solution
Ethers are generally flammable due to their hydrocarbon nature, although they have moderate boiling points.
Correct Answer: C — Flammable
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Q. Which of the following is a tertiary alcohol? (2021)
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A.
2-propanol
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B.
1-butanol
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C.
Cyclopentanol
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D.
1-pentanol
Solution
2-propanol (isopropanol) is a tertiary alcohol as the hydroxyl group is attached to a carbon that is connected to three other carbons.
Correct Answer: A — 2-propanol
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Q. Which of the following is an ether? (2023)
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A.
Ethyl alcohol
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B.
Dimethyl ether
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C.
Phenol
-
D.
Acetic acid
Solution
Dimethyl ether is an ether, characterized by the presence of an oxygen atom connected to two alkyl or aryl groups.
Correct Answer: B — Dimethyl ether
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Q. Which of the following is the correct IUPAC name for CH3-CH2-CH(OH)-CH3? (2020)
-
A.
2-butanol
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B.
1-butanol
-
C.
3-butanol
-
D.
2-pentanol
Solution
The compound CH3-CH2-CH(OH)-CH3 is 2-butanol, as the hydroxyl group is on the second carbon.
Correct Answer: A — 2-butanol
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Q. Which of the following is the correct method to prepare phenol? (2022)
-
A.
Hydrolysis of chlorobenzene
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B.
Oxidation of benzyl alcohol
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C.
Reduction of benzoic acid
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D.
Dehydration of phenyl ethanol
Solution
Phenol can be prepared by the hydrolysis of chlorobenzene using sodium hydroxide.
Correct Answer: A — Hydrolysis of chlorobenzene
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Q. Which of the following is the simplest ether? (2020)
-
A.
Dimethyl ether
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B.
Diethyl ether
-
C.
Ethyl methyl ether
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D.
Propyl ether
Solution
Dimethyl ether (CH3-O-CH3) is the simplest ether, consisting of two methyl groups bonded to an oxygen atom.
Correct Answer: A — Dimethyl ether
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Q. Which of the following statements about alcohols is correct? (2022)
-
A.
They are all soluble in water.
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B.
They have higher boiling points than alkanes.
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C.
They cannot form hydrogen bonds.
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D.
They are all volatile.
Solution
Alcohols have higher boiling points than alkanes due to the presence of hydrogen bonding.
Correct Answer: B — They have higher boiling points than alkanes.
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Q. Which of the following statements about alcohols is incorrect? (2022)
-
A.
They can form hydrogen bonds.
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B.
They are generally soluble in water.
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C.
They have higher boiling points than alkanes.
-
D.
All alcohols are volatile.
Solution
Not all alcohols are volatile; for example, long-chain alcohols have lower volatility.
Correct Answer: D — All alcohols are volatile.
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Q. Which of the following statements is true about phenols? (2023)
-
A.
They are stronger acids than alcohols
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B.
They do not react with bases
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C.
They are less soluble in water than alcohols
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D.
They are non-toxic
Solution
Phenols are stronger acids than alcohols due to the resonance stabilization of the phenoxide ion.
Correct Answer: A — They are stronger acids than alcohols
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Q. Which reagent is used to convert an alcohol into an alkyl halide? (2022)
-
A.
PCl5
-
B.
NaBH4
-
C.
LiAlH4
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D.
H2SO4
Solution
PCl5 is commonly used to convert alcohols into alkyl halides through a substitution reaction.
Correct Answer: A — PCl5
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