Explain the structure of PCl5 a) at high temperature b) at low temperature

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Please find below the solution to the asked query:


At low temperature, in the solid state, PCl5 exists as an ionic compound, in the form of two ions [PCl4]+[PCl6]- and according to VSEPR theory, the structure of [PCl4]+ ion is tetrahedral and [PCl6]- ion is octahedral.




At high temperature ,In vapour phase the geometry of PCl5 is Trigonal bipyramidal ( tbp).  The structure of PCl5  is shown below: 






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