Square planar complexes are formed by `d^(8)` ions with strong field ligands The crystal field splitting `Delta_(0)` is larger for the second and theird row transition elements and for more highly charged species All the complexes having `4d^(8)` and `5d^(8)` configurations are mostly square planar including those with weak field ligands such as halide ions square planar complexes can show geometrical isomerism but they do not show optical isomerism due to the presence of plane of symmetry
Among the following complexes which has a square planar geometry?
(a) `[RhCI(CO)(PPh_(3))_(2)]`
(b) `K_(3)[Cu(CN)_(4)]`
(c ) `[Ni(CO)_(4)]`
(d) `K_(2)[Zn(CN)_(4)]` .

Options

A. `Ni(+square square)` and Rh `(+square)` with strong field ligands
B. `Rh(+square)` and Ag `(+square square) ` with strong field ligand.
C. `Pd(+square square)` ,Pt `(square square)` and Au `(+square square square )` with strong and weak field ligands
D. None

Explanation

(D), All form square planar complexes.