1. Which of the following is an aliphatic amine?
A.
Methylamine
B.
Aniline
C.
Nitrobenzene
D.
Benzamide
Correct Answer:
Methylamine
Explanation:
Methylamine, CH3NH2, is an aliphatic amine because the nitrogen atom is attached to an alkyl group.
2. Amines in which nitrogen is attached to one alkyl group are called:
A.
Primary amines
B.
Secondary amines
C.
Tertiary amines
D.
Quaternary ammonium salts
Correct Answer:
Primary amines
Explanation:
A primary amine has one alkyl group attached to nitrogen and generally has the structure RNH2.
3. Which of the following is a primary aliphatic amine?
A.
CH3NH2
B.
(CH3)2NH
C.
(CH3)3N
D.
CH3NHCH2CH3
Correct Answer:
CH3NH2
Explanation:
Methylamine, CH3NH2, contains one methyl group attached to nitrogen, so it is a primary aliphatic amine.
4. Which formula represents a secondary aliphatic amine?
A.
RNH2
B.
R2NH
C.
R3N
D.
R4N+
Correct Answer:
R2NH
Explanation:
A secondary amine has two alkyl groups attached to nitrogen and one hydrogen, giving the general formula R2NH.
5. What type of aliphatic amine is dimethylamine, (CH3)2NH?
A.
Primary amine
B.
Secondary amine
C.
Tertiary amine
D.
Quaternary ammonium salt
Correct Answer:
Secondary amine
Explanation:
Dimethylamine has two methyl groups attached to nitrogen and one hydrogen, so it is a secondary aliphatic amine.
6. Which of the following is a tertiary aliphatic amine?
A.
CH3NH2
B.
(CH3)2NH
C.
(CH3)3N
D.
CH3CH2NH2
Correct Answer:
(CH3)3N
Explanation:
Trimethylamine, (CH3)3N, has three alkyl groups attached to nitrogen and no N-H bond, so it is a tertiary aliphatic amine.
7. The functional group present in a primary aliphatic amine is best represented as:
A.
–NH2
B.
–NO2
C.
–CONH2
D.
–N=N–
Correct Answer:
–NH2
Explanation:
Primary aliphatic amines contain the amino group, –NH2, attached to an alkyl group.
8. Which compound contains nitrogen bonded to two different alkyl groups?
A.
Methylamine
B.
Ethylamine
C.
Methyl ethyl amine
D.
Trimethylamine
Correct Answer:
Methyl ethyl amine
Explanation:
Methyl ethyl amine has a methyl group and an ethyl group attached to nitrogen, making it a secondary aliphatic amine.
9. Ethylamine, CH3CH2NH2, is classified as a:
A.
Primary aliphatic amine
B.
Secondary aliphatic amine
C.
Tertiary aliphatic amine
D.
Quaternary ammonium compound
Correct Answer:
Primary aliphatic amine
Explanation:
Ethylamine has one ethyl group attached to nitrogen and two hydrogen atoms, so it is a primary aliphatic amine.
10. Which structural feature identifies an aliphatic amine?
A.
Nitrogen attached to an alkyl group
B.
Nitrogen attached directly to a benzene ring
C.
Nitrogen present only in a nitro group
D.
Nitrogen attached to a carbonyl oxygen
Correct Answer:
Nitrogen attached to an alkyl group
Explanation:
Aliphatic amines are derivatives of ammonia in which one or more hydrogen atoms are replaced by alkyl groups.
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