White phosphorus on reaction with lime water gives calcium salt of an acid (A) along with a gas (X). Which of the following is correct?

White phosphorous + Lime water → Calcium salt of an acid (A) + Gas (X)
$2{\mathrm{P}}_4+8\mathrm{Ca}(\mathrm{OH}{)}_2+6{\mathrm{H}}_2\mathrm{O}⟶3\mathrm{Ca}{\left({\mathrm{H}}_2{\mathrm{PO}}_2\right)}_2+2{\mathrm{PH}}_3(\mathrm{X})$
(A) is H₃PO₂, hypophosphorous acid.
(A) is monobasic acid.
$2{\mathrm{H}}_3{\mathrm{PO}}_2\stackrel{∆}{\to }{\mathrm{H}}_3{\mathrm{PO}}_4+{\mathrm{PH}}_3$