Question

Fructose gives the silver mirror test because it

(a) contains an aldehyde group

(b) contains a keto group

(c) undergoes rearrangement under the alkaline conditions of the reagent to form a mixture of a glucose and mannose

(d) none of these.

Answer 1

The correct option of this question is (c).

Explain : Under alkaline conditions of the reagent, fructose gets converted into a mixture of glucose and mannose (Lobry de Bruyn van Ekenstein rearrangement) both of which contain the -CHO group and hence, reduce Tollens' reagent to give silver mirror test.