Step-by-step explanation:
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A hemiacetal is the product of a reaction between an aldehyde and an alcohol.
The structure is
R
|
RO-C-H
|
OH
An acetal has two alkoxy groups. The structure is :
H
|
OH-C-OR '
|
OR ''
Of the compounds given, the first two are hemiacetals.
The next three are acetals and the last two are others.