What functional group is present in glucose? Is glucose a reducing or nonreducing carbohydrate? 2 Circle and label the hemiacetal functional group and the acetal functional group in each of the following carbohydrates: Which carbohydrate in question would reduce Fehling's solution? Name the functional group that links two monosaccharides in a disaccharide. Would that be the same kind of functional group linking monosaccharides in long-chain polysaccharides like amylose?