Question

Assertion : Sucrose is a non-reducing sugar.

Reason : It has a glycosidic linkage.

• A. If both assertion and reason are true and the reason is the correct explanation of the assertion.
• B. If both assertion and reason are true but reason is not the correct explanation of the assertion.
• C. If assertion is true but reason is false.
• D. If the assertion and reason both are false.
• E. If assertion is false but reason is true.

Answer 1

The correct option is A If both assertion and reason are true and the reason is the correct explanation of the assertion.

Option (a)
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 groups. It contains stable acetal or ketal structure which cannot be opened into a free carboxyl group.

Sucrose is composed of alpha-D-glucopyranose unit and ß-D-fructofuranose unit. These units are joined by a-b-glycosidic linkage between C-1 of the glucose unit and C- 2 of the fructose unit.