The largest bond angle in

Options

A. `AsH_(3)`
B. `NH_(3)`
C. `H_(2)O`
D. `PH_(3)`

Explanation

(b) The largest bond angle is present in `NH_(3)(107^(@))`. All the given moleculares are `sp^(3)`-hybridised but due to the presence of 2 lone pairs in `H_(2)O`, its bond angle is less `(104.5^(@))`. While in `PH_(3)` and `AsH_(3)`, due to less difference in electronegativities, the bonded `e^(-)` pair remain between P and H (in `PH_(3)`) and As and H (in `AsH_(3)`) so that large lp-bp repulsion makes bond angle smaller.