HARDMCQ SINGLEJEE Mains ChemistryOrganic ChemistryBiomoleculesAchiever Section

Assertion: Sucrose is a non-reducing sugar. Reason: It has glycosidic linkage.

A.A

B.B✓ Correct

C.C

D.D (e) E

Explanation

Sucrose is a non-reducing sugar as it does not reduce Tollen's or Fehling's reagent, due to absence of free aldehyde or ketone group. It contains stable acetal or ketal structure which cannot be opened into a free carbonyl group. Sugar is composed of -D- glucopyranose unit and -D-fructofuranose unit. These units are joined by -glycosidic linkage between C-1 of the glucose unit and C-2 of the fructose unit. Thus, (b) is the correct option.

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