Question

Which of the following is a hemiacetal?

• A.

  

• B.

  

• C.

  

• D.

  

Hint:

Hemiacetals have one –OH and one –OR group on the same carbon, typically in sugars or cyclic intermediates.

Answer 1

The Correct Option is A

A hemiacetal contains both an –OH group and an –OR group on the same carbon atom (typically formed by the reaction of an aldehyde with an alcohol). In option (1), the molecule has a –CH(OH)–O– ring structure characteristic of cyclic hemiacetals.