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
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Q. What is the IUPAC name for the compound CH3OCH2CH3?
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A.
Ethyl methyl ether
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B.
Methyl ethyl ether
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C.
Dimethyl ether
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D.
Ethoxyethane
Solution
The compound CH3OCH2CH3 is commonly known as ethyl methyl ether, indicating the two different alkyl groups attached to the ether oxygen.
Correct Answer: A — Ethyl methyl ether
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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
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Q. What is the IUPAC name of CH3CH2OH?
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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 major product of the dehydration of 2-butanol?
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A.
Butene
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B.
Butyne
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C.
Butanol
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D.
Butanal
Solution
The dehydration of 2-butanol typically yields butene as the major product through an elimination reaction.
Correct Answer: A — Butene
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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
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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
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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
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Q. What type of reaction occurs when an alcohol reacts with a carboxylic acid?
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A.
Esterification
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B.
Hydrolysis
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C.
Oxidation
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D.
Reduction
Solution
The reaction between an alcohol and a carboxylic acid produces an ester and water, known as esterification.
Correct Answer: A — Esterification
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Q. Which functional group characterizes 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 are characterized by the presence of a hydroxyl (-OH) group attached to an aromatic ring.
Correct Answer: C — Hydroxyl
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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
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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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Q. Which of the following is a phenol?
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A.
C6H5OH
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B.
C2H5OH
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C.
C3H7OH
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D.
C4H9OH
Solution
C6H5OH contains a hydroxyl group (-OH) directly attached to a benzene ring, making it a phenol.
Correct Answer: A — C6H5OH
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