Question

Arrange the following in increasing order; PH3, NH3, SbH3, AsH3 in their bond angle

Answer 1

The electronegativity of group 15 elements decreases in order

N>P>As>Sb>Bi

N being most electronegative holds its lone pair tightly and hence requires larger bond angle and same order is followed by rest of the members.

So bond angle varies as

NH3> PH3> AsH3> SbH3