Which of the following compounds is square planar and does not have any unpaired electron ?

Options

A. `Ni(CO)_(4)`
B. `[Ni(H_(2)O)_(6)]^(2+)`
C. `[NiCl_(4)]^(2-)`
D. `[Ni(CN)_(4)]^(2-)`

Answer

D

Explanation

`Ni(CO)_(4)` : Tetrahedral. No unpaired electron.
`[Ni(H_(2)O)_(6)]^(2+)` : Octahedral . Two unpaired electrons.
`[NiCl_(4)]^(2+)` : Tetrahedral. Two unpaired electrons
`[Ni(CN)_(4)]^(2-)` : Square planar. No unpaired electrons