MCAT Organic Chemistry Question 2: Answer and Explanation
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Question: 2
2. Which of the following are considered terminal functional groups?
I. Aldehydes
II. Ketones
III. Carboxylic acids
- A. I only
- B. III only
- C. I and III only
- D. I, II, and III
Correct Answer: C
Explanation:
Aldehydes and carboxylic acids are characterized by their positions at the ends of carbon backbones and are thus considered terminal groups. As a result, the carbons to which they are attached are usually designated carbon 1. Ketones are internal by definition because there must be a carbon on either side of the carbonyl.