Identify P, Q and R in the following reaction sequence: P → NH_3 CH_3 COO^- NH_4^+ → Δ Q; PCl_5 R

Identify $\displaystyle \mathrm{P}, \mathrm{Q}$ and R in the following reaction sequence : \[\begin{aligned} \mathrm{P} & \xrightarrow{\mathrm{NH}_{3}} \mathrm{CH}_{3} \mathrm{COO}^{-} \mathrm{NH}_{4}^{+} \xrightarrow{\Delta} \mathrm{Q} \\ & \mathrm{PCl}_{5} \mathrm{R} \end{aligned} \]