Which of the following is a reducing sugar?

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Question

(D) reducing sugar is a carbohydrate that possesses a free aldehyde or ketone group,or a hemiacetal/hemiketal group that can open to form such a group

Vedclass · Accepted Answer

All of the above

Vedclass · Answer

(D) reducing sugar is a carbohydrate that possesses a free aldehyde or ketone group,or a hemiacetal/hemiketal group that can open to form such a group in solution.$1$. Maltose (shown in option $A$) is a reducing sugar because it has a free hemiacetal group at the $C1$ position of one glucose unit.$2$. Glucose (shown in option $B$) is an aldose and acts as a reducing sugar.$3$. Fructose (shown in option $C$) is a ketose,but it undergoes tautomerization in alkaline solution to form glucose and mannose,thus acting as a reducing sugar.Since all the given structures represent sugars that exhibit reducing properties,the correct answer is $D$.

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