In which of the following pairs, the two species are iso-structural ?
`{:((a)SO_(4)^(2-)and NO_(3)^(-),(b),BF_(3)andNF_(3)),((c )BrO_(3)^(-)and XeO_(3),(d),SF_(4)and XeF_(4)):}`

Explanation

(a) `SO_(4)^(2-) : H=^(1//2)[6+0-0+2]=4,sp^(3)` (tetrahedral)
`NO_(3)^(-) : H=^(1//2)[5+0-0+1]=3,sp^(2)` (trigonal)
(b) `BF_(3) : H=^(1//2)[3+3-0+0]=3,sp^(2)` (trigonal)
`NF_(3) : H=^(1//2)[5+3-0+0]=4,sp^(3)` (tetrahedral)
(c ) `BrO_(3)^(-) : H=^(1//2)[7+0-0+1]=4,sp^(3)` (tetrahedral)
`XeO_(3) : H=^(1//2)[8+0-0+0]=4,sp^(3)` (tetrahedral)
(d) `SF_(4) : H=^(1//2)[6+4-0+0]=5,sp^(3)d` (trigonal bipyrmidal)
`XeF_(4) : H=^(1//2)[8+4-0+0]=6,sp^(3)d^(2)` (octahedral)
Thus, we may conclude that `BrO_(3)^(-)` and `XeO_(3)` are iso-structural in nature.