Question

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

(a) Diamond, Silicon carbide 

(b) NH₃, PH₃ 

(c) XeF₄, XeO₄ 

(d) SiCl₄, PCl⁺₄

Answer 1

The correct option is : (c) XeF₄, XeO₄ 

Explanation:

In diamond and silicon carbide, central atom is sp³ hybridised and hence, both are isostructural. NH₃ and PH₃, both are pyramidal and central atom in both cases is sp³ hybridised. SiCl₄ and PCl⁺₄, both are tetrahedral and central atom in both cases is sp³ hybridised. 

In XeF₄, Xe is ,sp³d² hybridised and structure is square planar while in XeO₄, Xe is sp³ hybridised and structure is tetrahedral.