en \(\Rightarrow\) chelating ligand
\(CN =6,\) octahedral splitting hence laye splitting of \(d-\)subshell
\(\left[ Fe \left( H _{2} O \right)_{6}\right] Cl _{2} \Rightarrow H _{2} O \Rightarrow\) Weak filled ligand
\(Fe ^{+2} \Rightarrow[ Ar ] 3 d ^{6} 4 s ^{0}\) less plitting
\(CN =6\) octahedral splitting
$(I)\, [Ma_3b_2c]^{n \pm}\,\,\, (II)\, [M(AB)_3]^{n \pm}\,\,\, (III)\, [Ma_2b_2c_2]^{n \pm}$
$(I)\,\,\,-\,\,\,(II)\,\,\,-\,\,\,(III)$