Among the following statement which one is true?

Options

A. `NH_(3)` is less soluble than `PH_(3)` in water
B. `NH_(3)` is stronger base and stronger reducing agent than `PH_(3)`
C. `NH_(3)` has higher boiling point than `PH_(3)` and has lower melting point than `PH_(3)`
D. `PH_(3)` is stronger reducing agent than `NH_(3)` and it has lower critical temperature than `NH_(3)`

Answer

D

Explanation

`NH_(3)` is a weak reducing agent than `PH_(3)`, because X-H bond strength decreases down the group. Due to absence of H-bonding, only weak van der waals force of attraction exists in `PH_(3)`, it has lower critical temperature than `NH_(3)`.