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
,$[M \,(AB)\, (CD) \,ef]^{n\,±}$ (જ્યાં $AB,\,CD-$ અસમમિતીય દ્વિદંતીય લિગાન્ડ્, $e$, $f-$ એકદંતીય લિગાન્ડ્)