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In which of the following pairs the two species are not isostructural?
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The correct answer is:
$\mathrm{PF}_5$ and $\mathrm{BrF}_5$
$\mathrm{PF}_5$ and $\mathrm{BrF}_5$
(1) $\mathrm{CO}_3^{2-}$ \& $\mathrm{NO}_3^{-} \rightarrow \mathrm{Sp}^2$ hybridized, Trigonal planar
(2) $\mathrm{PCl}_4^{+}$\& $\mathrm{SiCl}_4 \rightarrow \mathrm{Sp}^3$ hybridized, Tetrahedral
(3) $\mathrm{PF}_5 \rightarrow \mathrm{Sp}^3 \mathrm{d}$ hybridized, Trigonal bipyramidal
$\mathrm{BrF}_5 \rightarrow \mathrm{Sp}^3 \mathrm{d}^2$ hybridized, square pyramidal
(4) $\mathrm{AlF}_6^{3-}$ \& $\mathrm{SF}_6 \rightarrow \mathrm{Sp}^3 \mathrm{d}^2$ hybridized, octahedral
(2) $\mathrm{PCl}_4^{+}$\& $\mathrm{SiCl}_4 \rightarrow \mathrm{Sp}^3$ hybridized, Tetrahedral
(3) $\mathrm{PF}_5 \rightarrow \mathrm{Sp}^3 \mathrm{d}$ hybridized, Trigonal bipyramidal
$\mathrm{BrF}_5 \rightarrow \mathrm{Sp}^3 \mathrm{d}^2$ hybridized, square pyramidal
(4) $\mathrm{AlF}_6^{3-}$ \& $\mathrm{SF}_6 \rightarrow \mathrm{Sp}^3 \mathrm{d}^2$ hybridized, octahedral
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