Find the Effective Atomic Number $(EAN)$ of $Fe$ in $Fe(CO)_5$.

The effective atomic number of Iron $(Z = 26)$ in $[Fe(CN)_6]^{3-}$ is

$EAN$ of the central metal in the complexes $K_2[Ni(CN)_4]$,$[Cu(NH_3)_4]SO_4$ and $K_2[PtCl_6]$ are respectively.

The $EAN$ of $Ni$ in $[Ni(CO)_4]$ is ....

Select the odd one w.r.t. $EAN$ :-

If $E.A.N.$ of central metal cation $M^{2+}$ in a non-chelating complex is $36$ and atomic number of metal $M$ is $26$,then the number of monodentate ligands in this complex are