Among the following species, identify the isostuctural pairs
`NF_(3). NO_(3)^(-), BF_(3), H_(3)O, HN_(3)`

Options

A. `[NF_(3) ,NO_(3)^(Theta)]` and `[BF_(3) ,H_(3)O^(o+)]`
B. `[NF_(3) ,N_(3)H]` and `[NO_(3)^(Theta) , BF_(3)]`
C. `[NF_(3), H_(3)O^(o+)]` and `[NO_(3)^(Theta), BF_(3)]`
D. `[NF_(3) ,H_(3) O^(o+)]` and `[N_(3) H, BF_(3)]`

Answer

C

Explanation

Hybridisation
(1) `overset(..)NF_(3) rArr (1)/(1) (5 +3) = 4 = sp^(3)`
(2) `NO_(3)^(Theta) rArr (1)/(2) (5 +0 +1) =3 =sp^(2)`
(3) `BF_(3) rArr (1)/(2) (3+3) =3 = sp^(2)`
(4) `H_(3)O^(o+) rArr (1)/(2) (6 +3-1) =4= sp^(3)`
(5) `NH_(3)` (Hydrazoic acid) is sp hybridised and is linear
Thus isostructural pairs are `[NF_(3),H_(3)O^(o+)]` and `[NO_(3)^(Theta) ,BF_(3)]`
.