Which is not a reducing sugar?

کون سا چینی کو کم کرنے والا نہیں ہے؟

Lactose

Glucose

Sucrose

None of these

Reducing sugars have a free aldehyde or ketone group that can reduce Benedict's or Fehling's solution.

Sucrose is a non-reducing sugar because its glycosidic bond prevents the free aldehyde or ketone from reacting.