Question

complete chemical reaction :C6H5NO2 in presence of Fe / hcl

Answer 1

In the presence of Fe/HCl nitrobenzene i.e C6H5NO2 changes into Aniline i.e C6H5NH2.
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Answer 2

Answer : The product formed is, Aniline

The reduction of  nitrobenzene in the presence of Fe/HCl to give aniline as a product. That means the reduction of nitro group gives $NH_2$.

The balanced chemical reaction will be,

$C_6H_5NO_2\overset{Fe/HCl}\rightarrow C_6H_5NH_2$

The reaction also shown below.