question_answer

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

A)  \[SiC{{l}_{4}},PCl_{4}^{+}\]                        

B)  Diamond, carbide

C)         \[N{{H}_{3}},P{{H}_{3}}\]          

D)         \[Xe{{F}_{4}},Xe{{O}_{4}}\]

Correct Answer: D

Solution :

(i) Structure of \[\text{SiC}{{\text{l}}_{\text{4}}}\] Structure of \[\text{PCl}_{\text{4}}^{\text{+}}\] (ii) Diamond and silicon carbide \[(SiC),\] both are isostructural because their central atom is \[s{{p}^{3}}\] hybridized and both have tetrahedral arrangement.   (iii) Structure of \[N{{H}_{3}}\] Structure of \[P{{H}_{3}}\] Both \[N{{H}_{3}}\] and \[P{{H}_{3}}\] have \[s{{p}^{3}}\] geometry. (iv) \[Xe{{F}_{4}}\] has \[s{{p}^{3}}{{d}^{2}}\] hybridisation while \[Xe{{O}_{4}}\] has \[s{{p}^{3}}\] hybridisation. Structure of \[Xe{{F}_{4}}\] Structure of \[Xe{{O}_{4}}\] Hence, \[Xe{{F}_{4}}\] and \[Xe{{O}_{4}}\] are not isostructural.