question 17 of 22 (1 point) | question attempt: 2 of unlimited

Brief Explanations:

A hemiacetal has a carbon atom bonded to one -OR (ether - like) group and one -OH group. An acetal has a carbon atom bonded to two -OR groups. In the first structure, the central carbon is bonded to two -OR groups ( - O - CH₂ - CH₃ and - O - CH₂ - CH₂ - CH₃) and one -OH group, so it is a hemiacetal. In the second structure, the carbonyl carbon is not bonded to any -OR groups, so it is neither a hemiacetal nor an acetal.

Answer:

First structure: hemiacetal Second structure: neither