Question

Which among the following is a non-reducing sugar?

• A. Lactose
• B. Maltose
• C. Sucrose
• D. Fructose

Answer 1

The correct option is C

Sucrose

The explanation for correct option

(C) Sucrose

Non reducing sugar

• “Sugars in which aldehyde or ketone functional groups are not free are called nonreducing sugars.”
• In the case of sucrose, the free aldehyde is not present.
• The structure of sucrose is as follows:-
• 
• Hence, sucrose is not a non-reducing sugar.

The explanation for the incorrect option

• “Sugars in which aldehyde or ketone functional groups are free are called reducing sugars, for example, lactose, maltose, and fructose.”
• Hence, the options (A), (B), and (D) are incorrect.

Hence, option (C) is correct. Sucrose is a non-reducing sugar.