\(\underset{\begin{smallmatrix}
EAN=37 \\
(Less\,stable)
\end{smallmatrix}}{\mathop{[Mn{{(CO)}_{6}}]}}\,\xrightarrow{-{{e}^{-}}}\underset{\begin{smallmatrix}
EAN=36 \\
(More\,stable)
\end{smallmatrix}}{\mathop{{{[Mn{{(CO)}_{6}}]}^{+}}}}\,\)
$(I)\ [Pt(NH_3)_6]Cl_4$
$(II) [Cr(NH_3)_6]Cl_3$
$(III) [Co(NH_3)Cl_2]Cl$
$(IV) K_2[PtCl_6]$
$5 {Fe}^{2+}+{MnO}_{4}^{-}+8 {H}^{+} \rightarrow {Mn}^{2+}+4 {H}_{2} {O}+5 {Fe}^{3+}$