1. What is the defining structural feature of a cyclic amine?
A.
The nitrogen atom is part of a ring
B.
The nitrogen atom is bonded only to hydrogen atoms
C.
The molecule contains a carbon-carbon triple bond
D.
The nitrogen atom is present only in a side chain
Correct Answer:
The nitrogen atom is part of a ring
Explanation:
A cyclic amine is an amine in which the nitrogen atom forms part of the ring structure.
2. Which of the following is a cyclic amine?
A.
Pyrrolidine
B.
Methylamine
C.
Ethylamine
D.
Aniline
Correct Answer:
Pyrrolidine
Explanation:
Pyrrolidine is a saturated cyclic amine because its nitrogen atom is included in a five-membered ring.
3. How many carbon atoms are present in the ring of pyrrolidine?
A.
Three
B.
Four
C.
Five
D.
Six
Correct Answer:
Four
Explanation:
Pyrrolidine has a five-membered ring containing one nitrogen atom and four carbon atoms.
4. How many carbon atoms are present in the ring of piperidine?
A.
Four
B.
Five
C.
Six
D.
Seven
Correct Answer:
Five
Explanation:
Piperidine contains a six-membered ring made up of one nitrogen atom and five carbon atoms.
5. Which cyclic amine contains a three-membered ring?
A.
Aziridine
B.
Pyrrolidine
C.
Piperidine
D.
Morpholine
Correct Answer:
Aziridine
Explanation:
Aziridine is a three-membered saturated ring containing one nitrogen atom and two carbon atoms.
6. Piperidine is best classified as a:
A.
Saturated cyclic amine
B.
Straight-chain primary amine
C.
Carboxylic acid
D.
Nitrile
Correct Answer:
Saturated cyclic amine
Explanation:
Piperidine has a saturated ring in which the nitrogen atom is part of the ring, so it is a saturated cyclic amine.
7. Which compound has a five-membered saturated ring containing one nitrogen atom?
A.
Pyrrolidine
B.
Piperidine
C.
Aziridine
D.
Methylamine
Correct Answer:
Pyrrolidine
Explanation:
Pyrrolidine contains a five-membered saturated ring with one nitrogen atom and four carbon atoms.
8. Which compound has a six-membered saturated ring containing one nitrogen atom?
A.
Aziridine
B.
Pyrrolidine
C.
Piperidine
D.
Ethylamine
Correct Answer:
Piperidine
Explanation:
Piperidine is a six-membered saturated cyclic amine containing one nitrogen atom and five carbon atoms.
9. In a cyclic amine, the nitrogen atom is generally:
A.
A part of the ring
B.
Always outside the ring
C.
Present only as a nitro group
D.
Joined to oxygen by a double bond
Correct Answer:
A part of the ring
Explanation:
The characteristic feature of cyclic amines is that the nitrogen atom is included in the ring skeleton.
10. Which of the following is not a cyclic amine?
A.
Piperidine
B.
Pyrrolidine
C.
Aziridine
D.
Propylamine
Correct Answer:
Propylamine
Explanation:
Propylamine is an open-chain amine because its nitrogen atom is not part of a ring, unlike piperidine, pyrrolidine, and aziridine.
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