Fructose reduces Tollen’s reagent due to

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Rearrangement of fructose into a mixture of glucose, fructose and mannose

Presence of ${NH}_{4} OH$ in Tollen’s reagent

Presence of ketonic group

Both (2) & (3)

answer is D.

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Detailed Solution

When fructose is treated with dil. Solution of an alkali, it undergoes reversible isomerization to form an equilibrium mixture of D-glucose, D-fructose and D – mannose.

It is due to isomerisation that fructose reduces Tollen’s reagent although it does not contain an –CHO group.

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