MCAT Organic Chemistry Question 87: Answer and Explanation
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Question: 87
12. To form a geminal diol, which of the following could attack a carbonyl carbon?
- A. Hydrogen peroxide
- B. Water
- C. Potassium dichromate
- D. Ethanol
Correct Answer: B
Explanation:
In a hydration reaction, water adds to a carbonyl, forming a geminal diol—a compound with two hydroxyl groups on the same carbon. Hydrogen peroxide and potassium dichromate are oxidizing agents, which can convert an aldehyde to a carboxylic acid. Ethanol will react with a carbonyl compound to form an acetal or a ketal, if excess ethanol is available.