Alcohols, Phenols and Ethers
Q. What is the IUPAC name for the compound CH3-CH2-O-CH2-CH3?
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A.
Ethyl methyl ether
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B.
Diethyl ether
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C.
Ethoxyethane
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D.
Methyl ethyl ether
Solution
The correct IUPAC name for CH3-CH2-O-CH2-CH3 is ethoxyethane.
Correct Answer: C — Ethoxyethane
Q. What is the IUPAC name of CH3-CH2-CH(OH)-CH3?
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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.
butan-1-ol
Solution
The compound has a hydroxyl group (-OH) on the second carbon of a four-carbon chain, making it 2-butanol.
Correct Answer: B — 2-butanol
Q. What is the major product when phenol is treated with bromine water?
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A.
Bromobenzene
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B.
2-bromophenol
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C.
4-bromophenol
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D.
Bromophenol
Solution
Phenol reacts with bromine water to predominantly form 2-bromophenol due to the activating effect of the hydroxyl group.
Correct Answer: C — 4-bromophenol
Q. What is the stereochemistry of 2-butanol?
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A.
R
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B.
S
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C.
R and S
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D.
Neither
Solution
2-butanol has a chiral center and can exist as both R and S enantiomers.
Correct Answer: C — R and S
Q. What type of reaction occurs when an alcohol is dehydrated?
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A.
Substitution
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B.
Elimination
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C.
Addition
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D.
Redox
Solution
Dehydration of an alcohol is an elimination reaction where water is removed, typically forming an alkene.
Correct Answer: B — Elimination
Q. Which functional group is present in phenols?
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A.
Aldehyde
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B.
Ketone
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C.
Hydroxyl
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D.
Carboxyl
Solution
Phenols contain a hydroxyl group (-OH) directly attached to an aromatic ring.
Correct Answer: C — Hydroxyl
Q. Which of the following compounds is an ether?
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A.
C2H5OH
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B.
C6H5OH
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C.
C2H5OC2H5
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D.
C3H7OH
Solution
C2H5OC2H5 is an ether, characterized by an oxygen atom connected to two alkyl or aryl groups.
Correct Answer: C — C2H5OC2H5
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