What are reducing sugars ?

Explanation

Carbohydrates which reduce Fehling's solution to red ppt. of `Cu_(2)O` or Tollens ' reagent to shinging metallic Ag are called reducing sugars. All monosaccharides (both aldoses and ketones) and disaccharides except sucrose are reducing sugars. Thus , `D-(+)`-glucose ,`D-(+)`-glucose , `D-(-)` -fructose ,`D-(+)` -maltose and `D-(+)`-lactose are all reducing sugars.