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Assertion : Bond lengths of $\mathrm{P}-\mathrm{Cl}$ bonds in gaseous $\mathrm{PCl}_5$ and solid $\mathrm{PCl}_5$ are not equal.
Reason : Because in solid state two $\mathrm{PCl}_5$ molecules are associated.
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Reason : Because in solid state two $\mathrm{PCl}_5$ molecules are associated.
Solution:
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The correct answer is:
If both assertion and reason are true and reason is the correct explanation of assertion.
As in solid state, $\mathrm{PCl}_5$ exists as an ionic solid $\left[\mathrm{PCl}_4\right]^{+}\left[\mathrm{PCl}_6\right]^{-}$in which the cation, $\left[\mathrm{PCl}_4\right]^{+}$ is tetrahedral and the anion, $\left[\mathrm{PCl}_6\right]^{-}$is octahedral. $\mathrm{PCl}_5$ in gaseous state has trigonal bipyramidal structure in which three equatorial bonds are equivalent, while the two axial bonds are longer than equatorial bonds due to more bond pair repulsion.
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