Which of the following has the highest boiling point?

Options

A. `AsH_(3)`
B. `SbH_(3)`
C. `PH_(3)`
D. `NH_(3)`

Answer

B

Explanation

Generally boiling point of hydrides increases down the group but B.P of `NH_(3) gt B.P`. of `PH_(3)`, because of hydrogen bonding in `NH_(3)`. The B.P. of `SbH_(3)` is still higher than `NH_(3)` because of its large size.
So, increasing order of boiling point is `to PH_(3) lt AsH_(3) lt NH_(3) lt SbH_(3)`