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  4. In which of the following, d- orbitals are not used by central atom in hybridisation?

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Q. In which of the following, $d-$ orbitals are not used by central atom in hybridisation?

Chemical Bonding and Molecular Structure

Solution:

$\underset{(s)}{PF _{5}}$ exists as $\underset{s p^{3}}{PF _{4}^{+}} \underset{s p^{3} d^{2}}{PF _{6}^{-}}$

$\underset{(s)}{PCl _{5}}$ exists as $\underset{sp^{3}}{PCl _{4}^{+}} \underset{sp^{3}d^{2}}{PCl _{6}^{-}}$

$\underset{(s)}{PBr_5}$ exists as $\underset{sp^{3}}{PBr^+_{4}} Br^{-}$

$\underset{sp^{3}d}{PBr_5}$ (in gaseous)