What happens when white phosphorus is heated with concentrated NaOH solution in an inert atmosphere of CO_2 ?
Phosphine is formed.
P _4+3 NaOH +3 H _2 O \xrightarrow{\text { Heat }} \underset{\text{Phosphine}}{PH _3}+\underset{\text{Sodium hypophosphite}}{3 NaH _2 PO _2}