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

Options

A. `NH_(3), PH_(3)`
B. `XeF_(4), XeO_(4)`
C. `SiCl_(4), PCl_(4)^(+)`
D. Diamond, silicon carbide

Answer

B

Explanation

`XeF_(4)implies` [steric number `=4`atoms +`2` lone pairs ]`implies` Geometery is octahdral but shape is square planar `XeO_(4)implies`[Steric number=`4`atoms +`0`lone pair]`implies`Geometery as well as shape is tetrahedral
(1) Both `NH_(3)` and `PH_(3)` (Steric number :`3+1=4`) are trigonal pyramidal in shape
(2) Both `SiCl_(4)` and `PCl_(4)^(+)` (Steric number : `4+0=4`) are tetrahedral in shape
` (3) Both diamond and `SiC` are network covalent solids with identical crystal lattice where every atom is covalently bonded to four other atoms oriented tetrahedrally.