Which among the following oxoacids of phosphorus shows a tendency of disproportaonation ?

Options

A. Phosphinic acid `(H_(3)PO_(2))`
B. Orthophosphoric acid `(H_(3)PO_(4))`
C. Phosphonic acid `(H_(3)PO_(3))`
D. Pyrophosphoric acid `(H_(4)P_(2)O_(7))`

Answer

C

Explanation

Phosphonic acid `(H_(3)PO_(3))`, oxoacid of
Phosphorus shows a tendency of disproportionation. On heating `H_(3)PO_(3)`
disproportionates to give orthophosphoric acid and phoosphene gas.
`4H_(3)PO_(3)overset(Delta)to3H_(3)PO_(4)+PH_(3)`