Among the following species, the H-X-H angle (X=B,N or P ) follows the order

Options

A. `PH_(3) lt NH_(3) lt NH_(4)^(+) lt BF_(3)`
B. `NH_(3) lt PH_(3) lt NH_(4)^(+) lt BF_(3)`
C. `BF_(3) lt PH_(3) lt NH_(4)^(+) lt NH_(3)`
D. `BF_(3) lt NH_(4)^(+) lt NH_(3) lt PH_(3)`

Answer

A

Explanation

`underset(120^(@))(BF_(3)) lt underset(109^(@)28)(NH_(4)^(+)) lt underset(107^(@))(NH_(3)) lt underset(92^(@))(PH_(3))`