(i) Draw the geometrical isomers of complex [ $\mathrm{Pt}(\mathrm{NH}_3)_2\mathrm{Cl}_2$ ]. (ii) On the basis of crystal field theory, write the electronic configuration for $d^4$ ion if $\Delta_{o} < P$. (iii) Write the hybridization and magnetic behaviour of the complex $[\mathrm{Ni}(\mathrm{CO})_4]$. (At.no. of $\mathrm{Ni} = 28$ )