1. A secondary amine contains a nitrogen atom bonded directly to how many carbon-containing groups?
A.
One
B.
Two
C.
Three
D.
Four
Correct Answer:
Two
Explanation:
In a secondary amine, nitrogen is directly bonded to two alkyl or aryl groups and usually one hydrogen atom.
2. Which of the following is a secondary amine?
A.
Methylamine, CH3NH2
B.
Dimethylamine, (CH3)2NH
C.
Trimethylamine, (CH3)3N
D.
Ammonia, NH3
Correct Answer:
Dimethylamine, (CH3)2NH
Explanation:
Dimethylamine has nitrogen bonded to two methyl groups and one hydrogen atom, so it is a secondary amine.
3. What is the general structural formula of an open-chain secondary amine?
A.
RNH2
B.
R2NH
C.
R3N
D.
R4N+
Correct Answer:
R2NH
Explanation:
The formula R2NH represents a nitrogen atom bonded to two organic groups, R, and one hydrogen atom.
4. What is the common name of (C2H5)2NH?
A.
Ethylamine
B.
Diethylamine
C.
Triethylamine
D.
Ethanamide
Correct Answer:
Diethylamine
Explanation:
The compound contains two ethyl groups attached to nitrogen, so its common name is diethylamine.
5. How many hydrogen atoms are directly bonded to nitrogen in a typical open-chain secondary amine?
A.
Zero
B.
One
C.
Two
D.
Three
Correct Answer:
One
Explanation:
A secondary amine has two carbon-containing groups and one hydrogen atom attached directly to nitrogen.
6. Which compound is classified as a secondary aryl amine?
A.
Aniline, C6H5NH2
B.
Diphenylamine, (C6H5)2NH
C.
Triphenylamine, (C6H5)3N
D.
Nitrobenzene, C6H5NO2
Correct Answer:
Diphenylamine, (C6H5)2NH
Explanation:
Diphenylamine has nitrogen bonded to two phenyl groups and one hydrogen atom, making it a secondary amine.
7. In the IUPAC name of a secondary amine, an alkyl group attached to nitrogen is commonly indicated by which prefix?
A.
N-
B.
O-
C.
S-
D.
C-
Correct Answer:
N-
Explanation:
The prefix N- shows that a substituent is attached directly to the nitrogen atom, as in N-methylethanamine.
8. Which formula represents a secondary amine rather than a primary or tertiary amine?
A.
CH3NH2
B.
CH3NHCH2CH3
C.
N(CH3)3
D.
NH3
Correct Answer:
CH3NHCH2CH3
Explanation:
In CH3NHCH2CH3, nitrogen is bonded to two carbon groups and one hydrogen atom, which is the structure of a secondary amine.
9. A secondary amine is formed when two hydrogen atoms of ammonia are replaced by which groups?
A.
Two organic groups
B.
One organic group
C.
Three organic groups
D.
One oxygen atom
Correct Answer:
Two organic groups
Explanation:
Replacing two hydrogen atoms of ammonia with alkyl or aryl groups gives the general secondary amine structure R2NH.
10. Which statement correctly describes a secondary amine?
A.
Nitrogen is bonded to one carbon group and two hydrogen atoms
B.
Nitrogen is bonded to two carbon groups and one hydrogen atom
C.
Nitrogen is bonded to three carbon groups and no hydrogen atoms
D.
Nitrogen is bonded to four carbon groups with a positive charge
Correct Answer:
Nitrogen is bonded to two carbon groups and one hydrogen atom
Explanation:
A secondary amine is defined by the presence of two organic groups and one hydrogen atom attached to the nitrogen atom.
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