Chapter 2, Problem 4KSP

What is the correct formula for phosphorus pentachloride?

$\begin{array}{l}\left(\text{a}\right)\hfill \\ {\text{PCl}}_{\text{5}}\hfill \\ \left(\text{b}\right)\hfill \\ {\text{P}}_{\text{5}}\text{Cl}\hfill \\ \left(\text{c}\right)\hfill \\ \text{P}{\left(\text{ClO}\right)}_{\text{5}}\hfill \\ \left(\text{d}\right)\hfill \\ {\text{po}}_{\text{4}}\text{Cl}\hfill \\ \begin{array}{l}\left(\text{e}\right)\\ \text{PClO}\end{array}\hfill \end{array}$