Question
What are reducing sugars?

Answer

Carbohydrates which reduces Fehling's solution to red precipitate of $Cu_20$ 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.

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