Which one of the following complex is not expected to exhibit isomerism

Options

A. `[Ni(en)_3]^(2+)`
B. `[Ni(NH_3)_4 (H_2 O)]^(2+)`
C. `[Pt(NH_3)_2 Cl_2]`
D. `[Ni(NH_3)_2 Cl_2]`

Answer

D

Explanation

In `[Ni(NH_3)_2 Cl_2], Ni^(2+)` is in `sp^3` hybridisation, thus tetrahedral in shape. Hence the four ligands are not different to exhibit optical isomerism. In tetrahedral geometry all the positions are adjacent to one another
`therefore` geometrical isomerism also is not possible.