Chemistry · Carbohydrates: Classification, aldoses and ketoses, monosaccharides (glucose and fructose) and constituent monosaccharides of oligosaccharides (sucrose, lactose and maltose)
Which one given below is a nonreducing sugar?
Which one given below is a nonreducing sugar?
- A. Maltose
- B. Lactose
- C. Glucose
- D. sucrose
Step-by-step solution
A nonreducing sugar has no free anomeric carbon available to reduce agents like Benedict's reagent. Sucrose is a disaccharide where the anomeric carbons of both glucose and fructose are involved in the glycosidic bond, so it is nonreducing. Glucose is a monosaccharide with a free aldehyde group, making it reducing. Maltose and lactose are disaccharides with one free anomeric carbon, so they are reducing sugars.