Biomolecules — Chemistry STD 12 Science — Question

Carbohydrates which reduces Fehling's solution to red precipitate of Cu₂0 or Tollen's reagent to metallic Ag are called reducing sugars. All monosaccharides (both aldoses and ketoses) and disaccharides except sucrose are reducing sugars. Thus, D - (+) - glucose, D-(-)-fructose, D - (+) - maltose and D - (+) - lactose are reducing sugars.