$H_{3}P{O}_3 \underset{on heating}{\overset{A}{\to }} \left[X\right] + \underset{\left(gas\right)}{ \left[Y\right]}$

Choose the correct option regarding above reaction. 

Heating of H₃PO₃ forms H₃PO₄ (phosphoric acid) and phosphine gas.

$4{\mathrm{H}}_3{\mathrm{PO}}_3\stackrel{∆}{\to }\underset{\left(\mathrm{X}\right)}{3{\mathrm{H}}_3{\mathrm{PO}}_4}+\underset{\left(\mathrm{Y}\right)}{{\mathrm{PH}}_3}\uparrow$

The structure of H₃PO₄ is given below. It is non-polar, sp³ hybridized and is nonplanar.

PH₃ has a rotten fish-like smell. It is nonplanar, has no hybridization, and has one lone pair of electrons on the central atom.