The CFSE for octahedral `[CoCl_(6)]^(4-)` is `18,000 cm^(-1)`. The CFSE for tetrahedral `[CoCl_(4)]^(2-)` will be

Options

A. `18, 000 cm^(-1)`
B. `16, 000 cm^(-1)`
C. `8, 000 cm^(-1)`
D. `20, 000 cm^(-1)`

Answer

C

Explanation

`CFSE` for octahedral and tetrahedral complexes are closely related to each other by formula `Delta_(t)=4/9 Delta_(0)`.
where, `Delta_(0)=CFSE` for octahedral complex, `Delta_(t)=CFSE` for tetrahedral complex
According to question, `Delta_(0)=18, 000 cm^(-1)`
`:." "Delta_(t)=4/9 Delta_(0)=4/9xx18,000 cm^(-1)`
`=4xx2,000 cm^(-1)=8, 000 cm^(-1)`
Hence, correct choice is (c).