Question

Isostructural species are those which have the same shape and hybridisation. Among the given species, identify the isostructural pairs.

• A. [$N{F}_3$ and $B{F}_3$]
• B. [$B{F}_4^{-}$ and $N{H}_4^{+}$]
• C. [$BC{l}_3$ and $BrC{l}_3$]
• D. [$N{H}_3$ and $N{O}_3^{-}$]

Answer 1

The correct option is B [$B{F}_4^{-}$ and $N{H}_4^{+}$]

From the structural point of the view, we see that,

$N{F}_3$ is pyramidal whereas $B{F}_3$ is planar triangular in structure.

$B{F}_4^{-}$ and $N{H}_4^{+}$ ions both are tetrahedral in structure.

$BC{l}_3$ is triangular planar whereas $BrC{l}_3$ is pyramidal in structure.

$N{H}_3$ is pyramidal whereas $N{O}_3$ is triangular planar structure.

So as we can see the only option B has both the elements same in structure.

The correct answer is option B.