1. What is the defining feature of a tertiary amine?
A.
Nitrogen is bonded to one carbon group
B.
Nitrogen is bonded to two carbon groups
C.
Nitrogen is bonded to three carbon groups
D.
Nitrogen is bonded to four hydrogen atoms
Correct Answer:
Nitrogen is bonded to three carbon groups
Explanation:
A tertiary amine has a nitrogen atom attached to three alkyl or aryl groups.
2. Which of the following is the general representation of a tertiary amine?
A.
RNH2
B.
R2NH
C.
R3N
D.
R4N+
Correct Answer:
R3N
Explanation:
Tertiary amines are represented as R3N, where nitrogen is bonded to three organic groups and has no N–H bond.
3. Which compound is a tertiary amine?
A.
Methylamine
B.
Dimethylamine
C.
Trimethylamine
D.
Ammonia
Correct Answer:
Trimethylamine
Explanation:
Trimethylamine, (CH3)3N, contains three methyl groups attached to nitrogen, so it is a tertiary amine.
4. What is the classification of triethylamine, (C2H5)3N?
A.
Primary amine
B.
Secondary amine
C.
Tertiary amine
D.
Quaternary ammonium salt
Correct Answer:
Tertiary amine
Explanation:
Triethylamine has three ethyl groups bonded to nitrogen and no hydrogen directly bonded to nitrogen; therefore, it is a tertiary amine.
5. How many carbon-containing groups are directly attached to nitrogen in a tertiary amine?
A.
One
B.
Two
C.
Three
D.
Four
Correct Answer:
Three
Explanation:
The classification tertiary indicates that three organic groups are directly attached to the nitrogen atom.
6. Which structural formula represents a tertiary amine?
A.
CH3NH2
B.
(CH3)2NH
C.
(CH3)3N
D.
NH3
Correct Answer:
(CH3)3N
Explanation:
In (CH3)3N, nitrogen is bonded to three methyl groups, making it a tertiary amine.
7. How many hydrogen atoms are directly attached to nitrogen in a typical tertiary amine?
A.
Zero
B.
One
C.
Two
D.
Three
Correct Answer:
Zero
Explanation:
A tertiary amine has three carbon groups attached to nitrogen, so no hydrogen atom is directly bonded to nitrogen.
8. Which name correctly describes (C2H5)3N?
A.
Ethylamine
B.
Diethylamine
C.
Triethylamine
D.
Tetraethylammonium ion
Correct Answer:
Triethylamine
Explanation:
The formula (C2H5)3N contains three ethyl groups attached to nitrogen and is named triethylamine, a tertiary amine.
9. A nitrogen atom bonded to three methyl groups forms which type of amine?
A.
Primary amine
B.
Secondary amine
C.
Tertiary amine
D.
Quaternary ammonium compound
Correct Answer:
Tertiary amine
Explanation:
Three methyl groups bonded to nitrogen give the structure (CH3)3N, which is a tertiary amine.
10. Which statement about tertiary amines is correct?
A.
They contain one organic group attached to nitrogen
B.
They contain two organic groups attached to nitrogen
C.
They contain three organic groups attached to nitrogen
D.
They contain four organic groups attached to nitrogen and carry a positive charge
Correct Answer:
They contain three organic groups attached to nitrogen
Explanation:
Tertiary amines contain three organic groups bonded to a neutral nitrogen atom and are represented by R3N.
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