In which of the following pairs the two species are not isostructural-

Options

A. `PCl_(4)^(+) and SiCl_(4)`
B. `PF_(5) and BrF_(5)`
C. `AlF_(6)^(3-) and SF_(6)`
D. `CO_(3)^(2-) and NO_(3)^(-)`

Answer

B

Explanation

In molecule `PF_(5),H=(1)/(2)[5+5-0+0]=5`. Hybridisation of central atom(P), `sp^(3)d`. Number of lone pairs in the central atom (P): 0. shape of the molecule, trigonal bypyramidal.
for `BrF_(5)` hybridisation of central
atom (Br), `sp^(3)d^(2)`. number of lone pairs in the central atom (Br), 1 shape of the molecule: square pyramidal.