${\mathrm{P}}_4+3\mathrm{NaOH}+3{\mathrm{H}}_2\mathrm{O}\to {\mathrm{PH}}_3+3{\mathrm{NaH}}_2{\mathrm{PO}}_2$

$\mathrm{Red} \mathrm{P} + \mathrm{Alkali} \stackrel{}{\to }{\mathrm{H}}_4{\mathrm{P}}_2{\mathrm{O}}_6$

White Phosphorous react with alkali metal hydroxide to form phosphine and a salt of ${\mathrm{H}}_3{\mathrm{PO}}_2^{-}$. While red phosphorous react with alkali to give oxoacid of phosphorus with no $\mathrm{P}-\mathrm{H}$ bonds.