For a octahedral complex $({\mathrm{d}}^6$ configuration$)$ having ${\mathrm{\Delta }}_0=25000 {\mathrm{cm}}^{-1}$ and $\mathrm{P}=15000 {\mathrm{cm}}^{-1},$ the crystal field stabilization energy is:

Select incorrect match for ${\left[\mathrm{M}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$ complex.

Which of the following is incorrectly matched complex?

Choose the complex, which is paramagnetic

(i) ${\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_6\right]}^{2+}$

(ii) ${\mathrm{K}}_3\left[\mathrm{Cr}{\left(\mathrm{CN}\right)}_6\right]$

(iii) ${\mathrm{K}}_3\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]$

(iv) ${\mathrm{K}}_2\left[\mathrm{Ni}{\left(\mathrm{CN}\right)}_4\right]$