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  4. Sucrose is NOT a reducing sugar since

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Q. Sucrose is NOT a reducing sugar since

KCETKCET 2012Biomolecules

Solution:

Carbohydrates which can reduce Tollen's reagent or Fehling solution are called reducing sugars. All the monosaccharides and the disaccharides (except sucrose) are reducing agent.

Sucrose does not have free aldehyde or keto group adjacent to $> CHOH $ group, therefore it fails towards Tollen's reagent and Fehling solution.