Question

Which of the following is a non-reducing sugar?

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

Hint:

To identify a non-reducing sugar, look for a disaccharide where both anomeric carbons are involved in the glycosidic bond, such as sucrose.

Answer 1

The Correct Option is B

A non-reducing sugar is one that cannot reduce the Benedict's reagent or Fehling's solution. This is typically due to the fact that both anomeric carbons in the sugar are involved in glycosidic bonds, preventing the formation of an aldehyde or ketone group that can reduce these reagents. - Sucrose is a disaccharide made up of glucose and fructose, where both the anomeric carbons are involved in the glycosidic bond, making it a non-reducing sugar. - Glucose, fructose, and maltose all have free aldehyde or ketone groups that can reduce reagents, making them reducing sugars. Therefore, the correct answer is option (B).