1. What is the general structural formula of a primary amine?
A.
RNH2
B.
R2NH
C.
R3N
D.
R4N+
Correct Answer:
RNH2
Explanation:
A primary amine has one alkyl or aryl group attached to the nitrogen atom, along with two hydrogen atoms, so its general formula is RNH2.
2. How many carbon-containing groups are directly attached to the nitrogen atom in a primary amine?
A.
One
B.
Two
C.
Three
D.
Four
Correct Answer:
One
Explanation:
Primary amines are classified by having only one carbon-containing group directly bonded to nitrogen.
3. Which of the following is a primary amine?
A.
Methylamine
B.
Dimethylamine
C.
Trimethylamine
D.
Tetramethylammonium ion
Correct Answer:
Methylamine
Explanation:
Methylamine, CH3NH2, contains one methyl group attached to nitrogen and is therefore a primary amine.
4. Which formula represents ethylamine, a primary amine?
A.
C2H5NH2
B.
(C2H5)2NH
C.
(C2H5)3N
D.
C2H5NH3+
Correct Answer:
C2H5NH2
Explanation:
Ethylamine has one ethyl group attached to nitrogen and two hydrogen atoms, giving the formula C2H5NH2.
5. Which of the following nitrogen compounds is classified as a primary amine?
A.
CH3CH2NH2
B.
CH3NHCH3
C.
N(CH3)3
D.
NH4Cl
Correct Answer:
CH3CH2NH2
Explanation:
CH3CH2NH2 has one ethyl group bonded to nitrogen, so it is a primary amine.
6. In a primary amine, how many hydrogen atoms are directly bonded to nitrogen?
A.
Two
B.
One
C.
Three
D.
Zero
Correct Answer:
Two
Explanation:
The nitrogen atom in a primary amine is bonded to one carbon-containing group and two hydrogen atoms.
7. Which compound is an aromatic primary amine?
A.
Aniline
B.
Diphenylamine
C.
Triphenylamine
D.
Benzene
Correct Answer:
Aniline
Explanation:
Aniline, C6H5NH2, has one phenyl group attached to nitrogen and is therefore an aromatic primary amine.
8. Which compound has the primary amine functional group?
A.
CH3NH2
B.
(CH3)2NH
C.
(CH3)3N
D.
CH3CONH2
Correct Answer:
CH3NH2
Explanation:
CH3NH2 contains the primary amine group, in which nitrogen is attached to one methyl group and two hydrogen atoms.
9. Which statement correctly describes a primary amine?
A.
Nitrogen is bonded to one carbon-containing group
B.
Nitrogen is bonded to two carbon-containing groups
C.
Nitrogen is bonded to three carbon-containing groups
D.
Nitrogen is bonded to four carbon-containing groups
Correct Answer:
Nitrogen is bonded to one carbon-containing group
Explanation:
The classification of an amine as primary means that nitrogen is directly attached to one alkyl or aryl group.
10. What is the class of amine represented by the formula C3H7NH2?
A.
Primary amine
B.
Secondary amine
C.
Tertiary amine
D.
Quaternary ammonium compound
Correct Answer:
Primary amine
Explanation:
In C3H7NH2, nitrogen is attached to one propyl group and two hydrogen atoms, so the compound is a primary amine.
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