A hemiketal is a compound prepared from a ketone and an alcohol and contains both OH and OR groups on the same carbon. Choice A describes a hemiacetal, choice C describes a carboxylic acid, choice D describes a hemiacetal with an acetyl group, and choice E describes a ketone with adjacent functional groups, but not a hemiketal.

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What Is a Hemiketal

Question 44

Multiple Choice

What is a hemiketal?

A) A hemiketal, prepared from an alcohol and an aldehyde, is a compound that contains both OH and OR groups on the same carbon.
B) Compounds prepared from ketones and alcohols and with OH and OR groups on the same carbon are known as hemiketals.
C) A hemiketal is a product of acetyl group hydrolysis; it contains a COOH functional group.
D) A hemiketal is formed from alcohols and acetic acid; a hemiacetal has both acetyl and OH groups on the same carbon atom.
E) A hemiketal, formed from a ketone and an alcohol, has OH and keto groups on adjacent carbon atoms in its structure.

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