Question

Among the hydrides of Group - 15 elements, which have the:-

• A. Lowest boiling point - phosphine.
• B. Maximum basic character - ammonia.
• C. Highest bond angle - ammonia.
• D. All are correct.

Answer 1

The correct option is D All are correct.

$P{H}_3$ has lowest boiling point because $N{H}_3$ has intermolecular hydrogen bonding and other hydrides hae higher van-der wall forces.

Most basic is ammonia because of highest electron density on nitrogen.

Highest bond angle is in ammonia as nitrogen has highest electron density , repulsion between lone pairs and bond pairs will be more resulting into more bond angle due to small size of nitrogen.