Identify the pair that is not isostructural.

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(A) Isostructural species have the same shape and hybridization.$PCl_5$ and $BrF_5$ are not isostructural.$PCl_5$: The central atom $P$ has $5$ bond p

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$PCl_5, BrF_5$

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(A) Isostructural species have the same shape and hybridization.$PCl_5$ and $BrF_5$ are not isostructural.$PCl_5$: The central atom $P$ has $5$ bond pairs and $0$ lone pairs,resulting in $sp^3d$ hybridization and a trigonal bipyramidal shape.$BrF_5$: The central atom $Br$ has $5$ bond pairs and $1$ lone pair,resulting in $sp^3d^2$ hybridization and a square pyramidal shape.Other pairs like $(CH_4, SiCl_4)$,$(CO_3^{2-}, NO_3^{-})$,and $(AlF_6^{3-}, SF_6)$ are isostructural as they have the same hybridization and geometry.

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