Question
Why is the bond angle in PH3 molecule lesser than that in NH3 molecule?
Solution
The bond pair in NH3 is close to N in N–H bond than the bond pair in P–H bond in PH3. This is because the size of the nitrogen is small than phosphorus. As a result, the force of repulsion between the bonded pair of electrons in PH3 is more than in NH3. Therefore, the bond angle in PH3 molecule is lesser than that in NH3molecule.
