In the gas phase `PCl_(5)` exists as individual molecules but in the solid it takes on the ionic structure `PCl_(4)^(+)PCl_(6)^(-)`. What are the geometries of these three species?

Options

A. `{:(,PCl_(5),PCl_(4)^(+),PCl_(6)^(-)),((a),"trigonal bipyramidal","see-saw","octahedral"):}`
B. `{:(,PCl_(5),PCl_(4)^(+),PCl_(6)^(-)),((b),"trigonal bipyramidal","tetrahedral","octahedral"):}`
C. `{:(,PCl_(5),PCl_(4)^(+),PCl_(6)^(-)),((c),"trigonal bipyramidal","square planar","distorted octahedral"):}`
D. `{:(,PCl_(5),PCl_(4)^(+),PCl_(6)^(-)),((d),"trigonal bipyramidal","see-saw","square planar"):}`

Answer

B