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-) , NO_3^-` Triangular planar
(b) `PCl_4^+ ,SiCl_4` Tetrahedral
(c ) `BrF_5 , PF_5 ` Trigonal bipyramidal square pyrimidal
(d)`AlF_6^(3-) , SF_6` octahedral