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Q.

Fructose reduces Tollen’s reagent due to 

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a

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

b

Presence of NH4OH in Tollen’s reagent

c

Presence of ketonic group

d

Both (2) & (3)

answer is D.

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Detailed Solution

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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.

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

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Fructose reduces Tollen’s reagent due to