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

Answer: (B)

$N{F}_3$ (pyramidal) and $B{F}_3$ (trigonal planar)
$B{F}_4^{-}$ (tetrahedral) and $N{H}_4^{+}$ (tetrahedral)
$BC{l}_3$ (trigonal planar) and $BrC{l}_3$ (trigonal bipyramidal)
$N{H}_3$ (pyramidal) and $N{O}_3^{-}$ (trigonal planar)
Thus, $B{F}_4^{-}$ and $N{H}_4^{+}$ are isostructural species.