Q. Which of the following amines is least soluble in water?
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A.
Methylamine
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B.
Ethylamine
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C.
Aniline
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D.
Tert-butylamine
Solution
Tert-butylamine is least soluble in water due to its bulky structure which hinders hydrogen bonding.
Correct Answer: D — Tert-butylamine
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Q. Which of the following amines is the most basic?
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A.
Methylamine
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B.
Ethylamine
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C.
Aniline
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D.
Dimethylamine
Solution
Dimethylamine is the most basic due to the electron-donating effect of the two methyl groups, which increases the electron density on the nitrogen.
Correct Answer: D — Dimethylamine
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Q. Which of the following compounds is a primary amine?
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A.
CH3NH2
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B.
(CH3)2NH
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C.
(CH3)3N
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D.
C6H5NH2
Solution
CH3NH2 is a primary amine as it has one alkyl group attached to the nitrogen.
Correct Answer: A — CH3NH2
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Q. Which of the following is a characteristic reaction of amines?
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A.
Nitration
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B.
Acylation
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C.
Halogenation
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D.
Oxidation
Solution
Acylation is a characteristic reaction of amines, where they react with acyl chlorides to form amides.
Correct Answer: B — Acylation
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Q. Which of the following is a method for preparing amines?
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A.
Reduction of nitriles
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B.
Hydrolysis of esters
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C.
Dehydration of alcohols
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D.
Oxidation of aldehydes
Solution
Amines can be prepared by the reduction of nitriles.
Correct Answer: A — Reduction of nitriles
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Q. Which of the following is a method for synthesizing amines?
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A.
Reduction of nitriles
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B.
Hydrolysis of amides
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C.
Alkylation of ammonia
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D.
All of the above
Solution
All listed methods can be used to synthesize amines.
Correct Answer: D — All of the above
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Q. Which of the following is a method for the preparation of amines?
-
A.
Reduction of nitriles
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B.
Hydrolysis of amides
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C.
Alkylation of ammonia
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D.
All of the above
Solution
All of the listed methods can be used to prepare amines.
Correct Answer: D — All of the above
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Q. Which of the following is a secondary amine?
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A.
Ethylamine
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B.
Dimethylamine
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C.
Methylamine
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D.
Aniline
Solution
Dimethylamine is a secondary amine as it has two alkyl groups attached to the nitrogen.
Correct Answer: B — Dimethylamine
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Q. Which of the following is the correct order of basicity for the given amines?
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A.
RNH2 > R2NH > R3N
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B.
R3N > R2NH > RNH2
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C.
R2NH > R3N > RNH2
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D.
RNH2 > R3N > R2NH
Solution
The basicity of amines decreases with increasing alkyl substitution due to steric hindrance and electron-donating effects.
Correct Answer: A — RNH2 > R2NH > R3N
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Q. Which of the following statements about amines is incorrect?
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A.
Amines are basic in nature.
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B.
Amines can form salts with acids.
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C.
Amines have higher boiling points than alcohols.
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D.
Amines can act as nucleophiles.
Solution
Amines generally have lower boiling points than alcohols due to the absence of hydrogen bonding in tertiary amines.
Correct Answer: C — Amines have higher boiling points than alcohols.
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Q. Which of the following statements about aromatic amines is true?
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A.
They are more basic than aliphatic amines
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B.
They are less basic than aliphatic amines
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C.
They do not react with acids
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D.
They are neutral compounds
Solution
Aromatic amines are less basic than aliphatic amines due to resonance stabilization of the lone pair on nitrogen.
Correct Answer: B — They are less basic than aliphatic amines
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