MCAT Organic Chemistry Question 82: Answer and Explanation

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Question: 82

7. What is the product of the reaction between benzaldehyde and an excess of ethanol (CH3CH2OH) in the presence of anhydrous HCl?

  • A.
  • B.
  • C.
  • D.

Correct Answer: D

Explanation:

Because an excess of ethanol is present, the product of the reaction between this aldehyde and ethanol will be an acetal. The benzaldehyde will first be converted to a hemiacetal, shown in choice (C), but will then proceed to completion as an acetal. Choices (A) and (B) are incorrect because they show the presence of two benzene rings in the final product.

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