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Question:

The appropriate reagent for the following transformation is

H2N−NH2,KOH/ethyleneglyco

Zn−Hg/HCl

Ni/H2

NaBH4

Solution:

Correct option is A. Zn−Hg/HCl. Both Wolff-Kishner and Clemmensen reduction are used. The latter is not suitable as it will also attack the -OH group of the ring. Therefore, A is the correct option.