MCAT Biochemistry Question 51: Answer and Explanation

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Question: 51

6. What is the product of the following reaction?

  • A.
  • B.
  • C.
  • D.

Correct Answer: B

Explanation:

When glucose reacts with ethanol under acid catalysis, the hemiacetal is converted to an acetal via replacement of the anomeric hydroxyl group with an alkoxy group. The result is a type of acetal known as a glycoside. This corresponds with choice (B). Choice (A) is incorrect because the –OH on the C-6 carbon would not be converted to –OCH3.

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