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Ketones do not reduce Tollen's reagent. ...

Ketones do not reduce Tollen's reagent. Why is fructose a reducing sugar ?

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The reaction with Tollen's reagent i.e., Ammoniacal silver nitrate is carried in the basic medium in which fructose is converted into enolic form which exists in equilibrium with glucose. Therefore, fructose behaves as a reducing sugar.
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