All of the following obey Sidgwick effective atomic number rule except :

Due to the fact that the $\mathrm{EAN}$value of $\mathrm{Fe}$in $K_3\left[Fe\right(CN{)}_6]$ is 35. It doesn't adhere to the $\mathrm{EAN}$rule.

$\left[\mathrm{Ni}(\mathrm{CO}{)}_4\right]$  EAN of Ni = 36

$\mathrm{Fe}{\left(\mathrm{CO}\right)}_5$ EAN of Fe = 36

${\left[\mathrm{V}(\mathrm{CO}{)}_6\right]}^{-}$  EAN of V= 36

${\mathrm{K}}_3\left[\mathrm{Fe}(\mathrm{CN}{)}_6\right]$  EAN of Fe = 35