The reduction of nitro compounds is most preferred in the presence of
The reduction of nitro compounds is most preferred in the presence of
$\mathrm{Pd} / \mathrm{H}_{2}$ in ethanol
$\mathrm{Sn}+\mathrm{HCl}$
finely divided Ni
iron scrap and $\mathrm{HCl}$
Solution
Reduction with iron scrap and hydrochloric acid is preferred because $\mathrm{FeCl}_{2}$ formed gets hydrolysed to release hydrochloric acid during the reaction. Thus, only a small amount of hydrochloric acid is required to initiate the reaction.
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