Organic Chemistry - Alcohols, Phenols & Ethers
Q. What type of reaction occurs when an alcohol is oxidized? (2023)
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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. Which of the following alcohols is most soluble in water? (2022)
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A.
1-butanol
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B.
2-butanol
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C.
3-butanol
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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 property of ethers? (2020)
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A.
High boiling point
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B.
Soluble in water
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C.
Flammable
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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 statements is true about phenols? (2023)
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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)
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A.
PCl5
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B.
NaBH4
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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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