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Fructose contains a keto group but still...

Fructose contains a keto group but still reduces Tollen's reagent. Explain

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Under the basic conditions of Tollen's reagent (ammoniacal silver nitrate solution), fructose undergoes Lobry de Bruyn van Ekenstein rearrangement to form an equilbrium mixture of fructose, glucose and mannose. Since both glucose and mannose contain free `-CHO` group, they reduce Tollen's reagent
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