Question
What are reducing sugars?
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Answer
Carbohydrates which reduces Fehling's solution to red precipitate of $\ce{Cu20}$ 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.
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