Answer:
Under the basic conditions of
Tollens' reagent, fructose undergoes Lobry de Bruyn van Eikenstein rearrangement
(refer to 'Competition Focus', page 14/88). As a result, fructose gives an
equilibrium mixture of fructose, glucose and mannose. Since both glucose and
mannose contain - CHO group, therefore, they reduce Tollens' reagent.
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