Alcohols & Phenols
Q. What is the boiling point trend among alcohols? (2020) 2020
-
A.
Decreases with molecular weight
-
B.
Increases with molecular weight
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C.
Remains constant
-
D.
Increases with branching
Solution
The boiling point of alcohols increases with molecular weight due to stronger hydrogen bonding.
Correct Answer: B — Increases with molecular weight
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Q. What is the boiling point trend of alcohols compared to alkanes?
-
A.
Higher
-
B.
Lower
-
C.
Same
-
D.
Varies
Solution
Alcohols have higher boiling points than alkanes due to hydrogen bonding.
Correct Answer: A — Higher
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Q. What is the functional group of alcohols? (2020)
-
A.
-OH
-
B.
-COOH
-
C.
-CHO
-
D.
-NH2
Solution
The functional group of alcohols is the hydroxyl group (-OH).
Correct Answer: A — -OH
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Q. What is the functional group of phenols? (2019) 2019
-
A.
-OH
-
B.
-COOH
-
C.
-CHO
-
D.
-NH2
Solution
Phenols contain a hydroxyl group (-OH) directly attached to an aromatic ring.
Correct Answer: A — -OH
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Q. What is the functional group present in phenols? (2021)
-
A.
-OH
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B.
-COOH
-
C.
-CHO
-
D.
-NH2
Solution
Phenols contain a hydroxyl group (-OH) directly attached to an aromatic hydrocarbon group.
Correct Answer: A — -OH
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Q. What is the functional group present in phenols? (2021) 2021
-
A.
-OH
-
B.
-COOH
-
C.
-CHO
-
D.
-NH2
Solution
Phenols contain a hydroxyl group (-OH) directly attached to an aromatic hydrocarbon group.
Correct Answer: A — -OH
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Q. What is the IUPAC name of CH3CH2OH? (2021) 2021
-
A.
Ethanol
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B.
Methanol
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C.
Propanol
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D.
Butanol
Solution
The compound CH3CH2OH is an alcohol with two carbon atoms, which is named Ethanol.
Correct Answer: A — Ethanol
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Q. What is the main product when phenol is treated with bromine?
-
A.
Bromobenzene
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B.
Bromophenol
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C.
Benzene
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D.
Bromobutane
Solution
Bromine reacts with phenol to form bromophenol, which is a substitution product.
Correct Answer: B — Bromophenol
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Q. What is the main product when phenol reacts with bromine? (2019)
-
A.
Bromobenzene
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B.
Bromophenol
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C.
Benzene
-
D.
No reaction
Solution
Phenol reacts with bromine to form Bromophenol, which is a brominated derivative of phenol.
Correct Answer: B — Bromophenol
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Q. What is the main product when phenol reacts with sodium hydroxide?
-
A.
Sodium phenoxide
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B.
Sodium benzoate
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C.
Benzene
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D.
Phenyl acetate
Solution
Phenol reacts with sodium hydroxide to form sodium phenoxide, which is a salt of phenol.
Correct Answer: A — Sodium phenoxide
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Q. What is the product of the oxidation of 2-Propanol? (2022)
-
A.
Acetone
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B.
Ethanol
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C.
Propanoic acid
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D.
Methanol
Solution
2-Propanol oxidizes to form Acetone, which is a ketone.
Correct Answer: A — Acetone
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Q. What is the product of the oxidation of a primary alcohol? (2020) 2020
-
A.
Aldehyde
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B.
Ketone
-
C.
Carboxylic acid
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D.
Alkene
Solution
The oxidation of a primary alcohol first produces an aldehyde, which can further oxidize to a carboxylic acid.
Correct Answer: A — Aldehyde
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Q. What is the product of the oxidation of ethanol?
-
A.
Acetic acid
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B.
Methanol
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C.
Butanoic acid
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D.
Propanoic acid
Solution
Ethanol oxidizes to acetic acid when reacted with an oxidizing agent.
Correct Answer: A — Acetic acid
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Q. Which alcohol is commonly known as rubbing alcohol?
-
A.
Ethanol
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B.
Isopropanol
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C.
Methanol
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D.
Butanol
Solution
Isopropanol, or 2-Propanol, is commonly referred to as rubbing alcohol.
Correct Answer: B — Isopropanol
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Q. Which alcohol is used as an antifreeze agent? (2022)
-
A.
Ethanol
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B.
Methanol
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C.
Isopropanol
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D.
Butanol
Solution
Methanol is commonly used as an antifreeze agent due to its low freezing point.
Correct Answer: B — Methanol
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Q. Which alcohol is used as an antifreeze? (2022)
-
A.
Methanol
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B.
Ethanol
-
C.
Isopropanol
-
D.
Butanol
Solution
Methanol is commonly used as an antifreeze due to its low freezing point.
Correct Answer: A — Methanol
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Q. Which of the following compounds is not an alcohol? (2023) 2023
-
A.
Ethanol
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B.
Methanol
-
C.
Phenol
-
D.
Isopropanol
Solution
Phenol is not classified as an alcohol because it has an aromatic ring, while the others are aliphatic alcohols.
Correct Answer: C — Phenol
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Q. Which of the following is a characteristic reaction of phenols? (2021) 2021
-
A.
Esterification
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B.
Nitration
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C.
Halogenation
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D.
Hydrogenation
Solution
Phenols undergo halogenation readily due to the electron-donating effect of the hydroxyl group.
Correct Answer: C — Halogenation
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Q. Which of the following is a primary alcohol? (2020) 2020
-
A.
2-Propanol
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B.
1-Butanol
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C.
Cyclohexanol
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D.
2-Pentanol
Solution
1-Butanol has the hydroxyl group (-OH) attached to a primary carbon, making it a primary alcohol.
Correct Answer: B — 1-Butanol
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Q. Which of the following is a primary alcohol? (2022) 2022
-
A.
1-butanol
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B.
2-butanol
-
C.
tert-butanol
-
D.
cyclohexanol
Solution
1-butanol has the hydroxyl group (-OH) attached to a primary carbon atom, making it a primary alcohol.
Correct Answer: A — 1-butanol
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Q. Which of the following is a secondary alcohol? (2021) 2021
-
A.
1-Pentanol
-
B.
2-Pentanol
-
C.
Cyclopentanol
-
D.
3-Pentanol
Solution
2-Pentanol has the hydroxyl group attached to a secondary carbon, making it a secondary alcohol.
Correct Answer: B — 2-Pentanol
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Q. Which reaction is characteristic of alcohols? (2020)
-
A.
Dehydration
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B.
Hydrogenation
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C.
Halogenation
-
D.
Oxidation
Solution
Dehydration is a characteristic reaction of alcohols where they lose water to form alkenes.
Correct Answer: A — Dehydration
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Q. Which reagent is commonly used to test for the presence of phenols?
-
A.
Bromine water
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B.
Sodium dichromate
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C.
Fehling's solution
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D.
Tollens' reagent
Solution
Bromine water is used to test for phenols, as they will decolorize bromine water.
Correct Answer: A — Bromine water
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Q. Which reagent is used to convert an alcohol to an alkyl halide? (2023) 2023
-
A.
PCl5
-
B.
NaOH
-
C.
H2SO4
-
D.
KMnO4
Solution
PCl5 is commonly used to convert alcohols to alkyl halides through a substitution reaction.
Correct Answer: A — PCl5
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