Give the preparation of phosphorus trichloride and phosphorus pentachloride.

(N/A) Preparation of phosphorus trichloride $(PCl_{3})$:
It is obtained by passing dry chlorine over heated white phosphorus:
$P_{4} + 6Cl_{2} \rightarrow 4PCl_{3}$
It is also obtained by the action of thionyl chloride with white phosphorus:
$P_{4} + 8SOCl_{2} \rightarrow 4PCl_{3} + 4SO_{2} + 2S_{2}Cl_{2}$
Preparation of phosphorus pentachloride $(PCl_{5})$:
Phosphorus pentachloride is prepared by the reaction of white phosphorus with excess of dry chlorine:
$P_{4} + 10Cl_{2} \rightarrow 4PCl_{5}$
It can also be prepared by the action of sulfuryl chloride $(SO_{2}Cl_{2})$ on white phosphorus:
$P_{4} + 10SO_{2}Cl_{2} \rightarrow 4PCl_{5} + 10SO_{2}$