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  4. The molecule which possesses both sp3 and sp3d2 hybridisation is

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Q. The molecule which possesses both $sp^3$ and $sp^3d^2$ hybridisation is

Chemical Bonding and Molecular Structure

Solution:

Solid $P C l_5$ ionises as
$2 PCl _5 \rightleftharpoons PCl _4^{+}+ PCl _6^{-}$
$PCl _4^{+}$is tetrahedral with $P$ undergoing $s p^3$ hybridisation
$P C l_6^{-}$is octahedral with $P$ undergoing $s p^3 d^2$ hybridisation.