Pick out the incorrect statement

Options

A. `PH_4^(+)` ion is tetrahedral like the `NH_(4)^(+)` ion and is obtained when `PH_3` is bonded to proton
B. `PH_4I` is one of the most stable salts containing the phosphonium ion. It is also more stable than ammonium salts
C. `PH_4I` is decomposed by water to form `PH_3`
D. `PH_3` converts silver salts in solution to silver phosphide, which subsequently reacts to give free metal.

Answer

B

Explanation

Phosphonium iodide is less thermally stable than ammonium salts, because phophine is less basic than ammonia and decomposition occurs at `60^(@)C`.
`PH_(4)I to PH_3+HI`
`a. PH_(3)+HI to PH_(3)I`
b. `PH_(4)I+H_(2)O to PH_(3)+H_(3)O^(+)+I^(-)`
d. `6Ag^(+)+PH_(3)+3H_(2) to 6Ag+H_(3)PO_(3)+6H^(+)`