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# Which of the following will be the best reagent for below transformation

$\begin{array}{1 1}(a)\;Zn-Hg/HCl&(b)\;NH_2-NH_2/NaOH\\(c)\;LiAlH_4&(d)\;(C_6H_5)_3SnH\end{array}$

$N_2H_4/NaOH$ (Waff-Kischner's reduction)
In this reaction aldehydes reduced to hydrocarbons .It won't affect the -OH groups.The mechanism as follows:
Hence (b) is the correct answer.