What functional groups are in glucose?
Glucose contains aldehyde, alcohol, and hemiacetal groups.
Glucose exists in a straight-chain form and in various cyclic forms.
In the straight-chain form, the functional group at C-1 is an aldehyde group.
The functional groups on C-2 to C-6 are alcohol groups.
In the cyclic form, the functional group on C-1 is a hemiacetal group.
A hemiacetal has an OH and an OR group on the same carbon atom.