Counting every molecule of phenylhydrazine that reacts (including the one reduced to aniline and ammonia), the moles of phenylhydrazine consumed in converting 1 mol of D-glucose to its osazone are

Answer: C

One molecule condenses with the CHO group to give the hydrazone, a second oxidises the C-2 CHOH to C=O and is itself reduced to aniline and ammonia, and a third condenses with the new C=O. Total 3.

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