C₆^-IH₅NO₂ + 3 Fe⁰ + 7 HCl → C₆^-IIH₅NH₃Cl + 3 Fe^IICl₂ + 2 H₂O

This is an oxidation-reduction (redox) reaction:

6 C^-I + 6 e^- → 6 C^-II (reduction)

3 Fe⁰ - 6 e^- → 3 Fe^II (oxidation)

Change the oxidation states

Search by reactants (C₆H₅NO₂, Fe, HCl)

1.	C6H5NO2 + Fe + HCl → C6H5NH2 + FeCl2 + H2O
2.	C6H5NO2 + Fe + HCl → C6H5NH3Cl + FeCl2 + H2O
3.	C6H5NO2 + Fe + HCl → C6H5NH2 + FeCl3 + H2O
4.	C6H5NO2 + Fe + HCl → C6H5NH3 + FeCl2 + H2O

Search by products (C₆H₅NH₃Cl, FeCl₂, H₂O)

1.	C6H5NO2 + Fe + HCl → C6H5NH3Cl + FeCl2 + H2O

Search by reactants (C₆H₅NO₂, Fe, HCl) and by products (C₆H₅NH₃Cl, FeCl₂, H₂O)

1.	C6H5NO2 + Fe + HCl → C6H5NH3Cl + FeCl2 + H2O