Which Compound is NOT a Reducing Sugar

Question

Which compound is NOT a reducing sugar?
A) fructose
B) glucose
C) glyceraldehyde
D) ribose
E) sucrose

Accepted Answer

Sucrose is a non-reducing sugar because it does not have a free anomeric carbon that can participate in a reducing reaction. The other options (fructose, glucose, glyceraldehyde, and ribose) are all reducing sugars because they have free anomeric carbons that can be oxidized (reduced) during a chemical reaction.