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In which of the following pairs, both the species are not isostructural?
A
$NH_3$, $PH_3$
B
$XeF_4$, $XeO_4$
C
$SiCl_4$, $PCl_4^+$
D
Diamond, silicon carbide
Detailed Solution
$NH_3$ and $PH_3$: $sp^3$ with one lone pair, both pyramidal.
$XeF_4$: $sp^3d^2$, square planar; $XeO_4$: $sp^3$, tetrahedral — not isostructural.
$SiCl_4$ and $PCl_4^+$: both $sp^3$, tetrahedral.
Diamond and SiC: both have tetrahedral arrangement with $sp^3$ central atoms.
$XeF_4$: $sp^3d^2$, square planar; $XeO_4$: $sp^3$, tetrahedral — not isostructural.
$SiCl_4$ and $PCl_4^+$: both $sp^3$, tetrahedral.
Diamond and SiC: both have tetrahedral arrangement with $sp^3$ central atoms.