Amines - Preparation & Properties
Q. What is the effect of increasing the number of alkyl groups on the basicity of amines?
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A.
Increases basicity
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B.
Decreases basicity
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C.
No effect
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D.
Depends on the solvent
Solution
Increasing the number of alkyl groups generally increases the basicity of amines due to the electron-donating effect.
Correct Answer: A — Increases basicity
Q. What is the IUPAC name of the compound CH3-CH2-NH2?
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A.
Ethylamine
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B.
Propylamine
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C.
Dimethylamine
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D.
Isopropylamine
Solution
The compound CH3-CH2-NH2 is named ethylamine according to IUPAC nomenclature.
Correct Answer: A — Ethylamine
Q. What is the main product when an amine reacts with a carboxylic acid?
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A.
Amide
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B.
Ester
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C.
Alcohol
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D.
Aldehyde
Solution
The main product of the reaction between an amine and a carboxylic acid is an amide.
Correct Answer: A — Amide
Q. What is the product of the reaction between an amine and an alkyl halide?
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A.
Amide
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B.
Quaternary ammonium salt
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C.
Nitrile
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D.
Alcohol
Solution
The reaction between an amine and an alkyl halide typically produces a quaternary ammonium salt.
Correct Answer: B — Quaternary ammonium salt
Q. Which of the following compounds is a secondary amine?
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A.
CH3-NH2
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B.
CH3-CH2-NH-CH3
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C.
CH3-CH2-CH2-NH2
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D.
NH3
Solution
The compound CH3-CH2-NH-CH3 is a secondary amine as it has two alkyl groups attached to the nitrogen.
Correct Answer: B — CH3-CH2-NH-CH3
Q. Which of the following is a characteristic property of amines?
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A.
They are acidic
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B.
They have a fishy odor
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C.
They are non-polar
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D.
They do not form hydrogen bonds
Solution
Amines typically have a fishy odor due to their structure and are known for their ability to form hydrogen bonds.
Correct Answer: B — They have a fishy odor
Q. Which of the following is a method for the preparation of aromatic amines?
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A.
Reduction of nitro compounds
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B.
Hydrolysis of nitriles
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C.
Alkylation of aniline
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D.
Dehydration of amides
Solution
Aromatic amines can be prepared by the reduction of nitro compounds.
Correct Answer: A — Reduction of nitro compounds
Q. Which of the following methods can be used to prepare primary 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
Primary amines can be prepared by the reduction of nitriles, hydrolysis of amides, and alkylation of ammonia.
Correct Answer: D — All of the above
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