Regarding phosphorous pentachloride, the incorrect statement is

In liquid phase it exists as an ionic solid

In solid state it exists as ${\left[{\mathrm{PCl}}_4\right]}^{+}{\left[{\mathrm{PCl}}_6\right]}^{-}$

In gas phase , it has trigonal bipyramidal geometry

$\mathrm{P}-{\mathrm{Cl}}_{\mathrm{axial}}$ bond length is longer than  $\mathrm{P}-{\mathrm{Cl}}_{\mathrm{equatorial}}$ bond length in gas phase