When thionyl chloride undergoes a reaction with white phosphorus, phosphorus pentachloride and sulphur dioxide is produced. P4+10SO2Cl2→4PCl5+10SO2(X) When HCl gas undergoes a reaction with oxygen in theavailability of CuCl2 , it produces water and chlorine gas. 4HCl+O2
723K
–––––––🢖
CuCl2
2Cl2
(Y)
+
2H2O
(X)
Now, when Y reacts with X in water, it produces HCl (A) and H2SO4(B) SO2+2H2O+Cl2→