Which of the following is ${\mathrm{sp}}^3\mathrm{d}$ hybridized as well as as trigonal bipyramidal geometry? 

Phosphorus contains 5 electrons of valence. Therefore, PCl₅ molecules have sp³d hybridization and therefore a trigonal bipyramidal structure, 1 electron each is shared by chlorine atom.

${\mathrm{PCl}}_5$ is ${\mathrm{sp}}^3\mathrm{d}$ as well as TBP geometry.

Hence, the correct option is B.