Question

Bcl3 is planar but NH3 is pyramidal. ​

Answer 1

hii dear. .bcl3 is. planner but nh3 is pyramidal because of num of loan pair.

Answer 2

The presence of bond pair and lone pair affects the size of the molecule.

Explanation:

• This is because lone pairs and bond pairs repel each other and eventually change the shape of the molecule.
• BCl3 has sp2 hybridization and no lone pair of electron on the central atom, but NCl3 has sp3 hybridization and also has a lone pair of electron on nitrogen, so BCl3 is planar.
• Bcl3 is a planar molecule whereas ncl3 is pyramidal because

(a) nitrogen atom is smaller than boron atom

(d) bcl3 has no lone pair of electrons where ncl3 has a lone pair of electrons.

• In BCl3 there is no lone pair on boron so there is no repulsion.
• NCl3 has a lone pair on the nitrogen hence repulsion.
• Hence BCl3 is a planar molecule but NCl3 is a pyramidal molecule.