Question

In which of the following pairs, both the species are not isostructural?

• A. $N{H}_3,P{H}_3$
• B. $Xe{F}_4,Xe{O}_4$
• C. $SiC{l}_4,PC{l}_4^{+}$
• D. Diamond, silicon crabide

Answer 1

The correct option is B $Xe{F}_4,Xe{O}_4$

(i) Hybridisation of $N{H}_{3}andP{H}_3[\sigma =3,lp=1]$ is $s{p}^3$ Geometry: Tetrahedral

(ii) Structures of $Xe{F}_4$ is square planar.

Structure of $Xe{O}_4$ is tetrahedral

$\therefore Xe{F}_4$ and $Xe{O}_4$ are not isostructural
(iii) Structure of $SiC{l}_4$ is tetrahedral

Structure of $PC{l}_4^{+}$ is tetrahedral

(iv) Diamond & $SiC$ both are isostructural because both have tetrahedral arrangement and the central atom is $s{p}^3$ hybridised.