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Fructose reduces Tollen’s reagent due to

1. (a) enolisation of fructose followed by conversion to aldehyde by base
2. (b) asymmetric carbons
3. (c) primary alcoholic group
4. (d) secondary alcoholic group

Correct answer: (a) enolisation of fructose followed by conversion to aldehyde by base

Solution

Fructose reduces Tollen's reagent because, in an alkaline medium, it undergoes enolization and isomerizes to glucose and mannose, which contain aldehyde groups that can reduce Tollen's reagent.

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