Match List I with List II : List I (Complex/ion) List II...

For $[\text{Pt}(\text{Cl}_2)(\text{NH}_3)_2]$, Pt is in $+2$ oxidation state. Pt(II) complexes are generally square planar with $dsp^2$ hybridization.

For $[\text{Co}(\text{NH}_3)_6]\text{Cl}_3$, Co is in $+3$ oxidation state. With a coordination number of 6, it forms an octahedral geometry.

For $[\text{NiCl}_4]^{2-}$, Ni is in $+2$ oxidation state ($3d^8$). Since $\text{Cl}^-$ is a weak field ligand, no pairing of electrons occurs, resulting in $sp^3$ hybridization and a tetrahedral geometry.

For $[\text{Fe}(\text{CO})_5]$, Fe is in $0$ oxidation state. With a coordination number of 5, it forms a trigonal bipyramidal geometry with $dsp^3$ hybridization.

Therefore, the correct matching is A $\rightarrow$ III, B $\rightarrow$ I, C $\rightarrow$ IV, D $\rightarrow$ II.

Answer: A-III, B-I, C-IV, D-II