Among the following the pair in which the two species are not isostuctural is

Options

A. `SiF_(4) and SF_(4)`
B. `IO_(3)^(-) and XeO_(3)`
C. `BH_(4)^(-) and NH_(4)^(+)`
D. `PF_(6)^(-)` and `SF_(6)`

Answer

c

Explanation

Both `NH_(4)^(+)` and `[BF_(4)]^(-)` have tetrabedral shape due to `sp^(2)` hybridization