The correct answer is A:\(PCl_5, \, SO_2\)
When sulphuryl chloride \(\left( SO _{2} Cl _{2}\right)\) reacts with white phosphorus \(\left( P _{4}\right)\), it give phosphorus pentachloride \(\left( PCl _{5}\right)\) and' sulphur dioxide \(\left( SO _{2}\right)\). The reaction is as follows:
\(P _{4}+10\, SO _{2} Cl _{2} \longrightarrow 4 PCl _{5}+10 SO _{2}\)