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Q. Assertion: Fructose is a reducing sugar.
Reason: It has a ketonic group.

AIIMSAIIMS 2011Biomolecules

Solution:

All those carbohydrates which contain aldehydic or ketonic group in the hemiacetal or hemiketal form and reduce Tollen's or Fehling's solutions are reducing sugars. All monosaccharides are reducing sugars (whether aldoses or ketoses).

Fructose is a monosaccharide with keto group.