Question

Which one of the following pairs is iso-structural ?

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

Answer 1

Answer: (D)

If number of $B.P.$ and $L.P$ are same for the given pairs, they are isostructural.

a.	$3\sigma$ bond	a.	$3\sigma$ bonds + 2 lone pairs
b.	$s{p}^2$-hybridatoin	b.	$s{p}^{3}d$ hybridisation
c.	Electronic geometryTrigonal planar	c.	Electronic geometry: Distorted trigonal bipyramidal
d.	Molecular geometry/shape: Trigonal planar	d.	Molecular geometry/ shape: Bent T-shape

(b) $N{H}_3$ and $N{O}_3^{-}$

a.	$3\sigma$ bond + 1 lone pair	a.	$3\sigma$ bonds + 0 lone pairspairs
b.	$s{p}^3$-hybridatoin	b.	$s{p}^2$ hybridisation
c.	Electronic geometry-distorted tetrahedral	c.	Electronic geometry- Trigonal planar
d.	Molecular geometry/shape-pyramidal	d.	Molecular geometry shape - trigonal planar

(c) $N{F}_3$ and $B{F}_3$

a.	$3\sigma$ bond + 1 lone pair on central atom	a.	$3\sigma$ bonds + 0 lone pairs on central atom
b.	$s{p}^3$-hybridatoin	b.	$s{p}^2$ hybridisation
c.	Electronic geometry-distorted tetrahedral	c.	Electronic geometry- Trigonal planar
d.	Molecular geometry/shape-pyramidal	d.	Molecular geometry shape - trigonal planar

(d) $B{F}_4^{-}$ and $N{H}_4^{+}$

a.	$4\sigma$ bond	a.	$4\sigma$ bonds
b.	$s{p}^3$-hybridatoin	b.	$s{p}^3$ hybridisation
c.	Electronic geometry-tetrahedral	c.	Electronic geometry- tetrahedral
d.	Molecular geometry/shape-tetrahedral	d.	Molecular geometry: tetrahedral