MCAT Organic Chemistry Question 139: Answer and Explanation
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Question: 139
4. Nylon, a polyamide, is produced from hexanediamine and a substance X. This substance X is most probably a(n):
- A. amine.
- B. carboxylic acid.
- C. ketone.
- D. alcohol.
Correct Answer: B
Explanation:
An amide is formed from an amine and a carboxyl group or its acyl derivatives. In this question, an amine is already given; the compound to be identified must be an acyl compound. The only acyl compound among the choices given is a carboxylic acid.