Question

hemiacetal
acetal
neither
hemiacetal
acetal
neither

Explanation:

Step1: Recall hemiacetal and acetal definitions

A hemiacetal has a carbon atom bonded to an -OH group and an -OR group. An acetal has a carbon atom bonded to two -OR groups.

Step2: Analyze first compound

In the first structure, the carbon atom next to the -OH has an -OR group attached to it. So it is a hemiacetal.

Step3: Analyze second compound

In the second structure, the central carbon has two -OR groups attached to it. So it is an acetal.

Answer:

1. hemiacetal
2. acetal