In which of the following pairs, the two species are not isostructural?

Options

A. `CO_3^(2-)` and `NO_3^(-)`
B. `PCl_4^(+)` and `SiCl_4`
C. `PF_5` and `BrF_5`
D. `AlF_6^(3-)` and `SF_6`

Answer

C

Explanation

(a)`CO_3^(2-)` and `NO_3 to sp^2` hybridised,Trigonal planar
(b)`PCl_4^+` and `SiCl_4 to sp^3` hybridised , Tetrahedral
(c )`PF_5 to sp^3`d hybridised , Trigonal bipyramidal
`BrF_5 to sp^3 d^2` hybridised , Square pyramidal