Which of the following substances reduce warm Tollens reagent to give a silver mirror? (more than one may be correct)

Asucrose
Bfructose
Cpropanone
Dmethanoic acid

Answer: B, D

Methanoic acid has a free CHO unit, and fructose isomerises through an enediol in the alkaline medium to an aldose, so both reduce Tollens reagent. Sucrose has no free anomeric carbon and propanone is a simple ketone, so both are negative.

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