MCAT Organic Chemistry Question 117: Answer and Explanation
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Question: 117
12. The intramolecular reaction of 5-aminopentanoic acid through nucleophilic acyl substitution would result in a(n):
- A. anhydride.
- B. lactone.
- C. lactam.
- D. carboxylic acid.
Correct Answer: C
Explanation:
5-aminopentanoic acid contains a carboxylic acid and an amine. If this molecule undergoes intramolecular nucleophilic acyl substitution, it will form a cyclic amide. These molecules are called lactams. Lactones, choice (B), are cyclic esters, not amides.