White phosphorus when boiled with strong solution of caustic soda produces
Correct option is A. Phosphine
White phosphorus when boiled with a strong solution of caustic soda produces phosphine gas.
$$P_4+3H_2O+3NaOH\to \underset{Phosphine }{PH_3} +\underset{Sod.\ hypopophosphite}{3NaH_2PO_2}$$