MCAT Organic Chemistry Question 109: Answer and Explanation

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Question: 109

4. Which of the following molecules could be classified as a soap?

A. CH₃(CH₂)₁₇CH₂COOH
B. CH₃COOH
C. CH₃(CH₂)₁₉COO^–Na⁺
D. CH₃COO^–Na⁺

Correct Answer: C

Explanation:

Soap is a salt of a carboxylate anion with a long hydrocarbon tail. Choices (A) and (B) are not salts of anionic compounds. Choice (D) is sodium acetate, which is a salt but does not contain the long hydrocarbon tail needed to be considered a soap.

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