Question

Bond angle in $P{H}_3$ is:

• A. much less than $N{H}_3$
• B. much less than $P{F}_3$
• C. slightly more than $N{H}_3$
• D. much more than $P{F}_3$

Answer 1

The correct option is A much less than $N{H}_3$

The bond pair in $N{H}_3$ is close to $N$ in $N-H$ bond than the bond pair in $P-H$ bond in $P{H}_3$.

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 $P{H}_3$ is more than in $N{H}_3$.

Therefore the bond angle in $P{H}_3$ molecule lesser than in $N{H}_3$ bond angle in $P{H}_3$ is 93.5 and in $N{H}_3$ is 107.8.

Option A is correct.