Which of the following is an outer d-orbital or high spin complex ?

Options

A. `[Co(NH_(3))_(6)]^(3+)`
B. `[Ni(CN)_(4)]^(2-)`
C. `[NiCl_(4)]^(2-)`
D. `[CoF_(6)]^(3-)`

Answer

D

Explanation

`[Co(NH_(3))_(6)]^(3+), [Ni(CN)_(4)]^(2-) and [NiCl_(4)]^(2-)` are inner d-orbital or high spin complex. `[CoFe_(6)]^(3-), Co=4s^(2), 3d^(7), 4p^(0)`
`Co^(3+)=3d^(6), 4s^(0), 4p^(0)`

Here `F^(-)` is a weak legend so no pairing of electron takes place