Question

The BCl₃ is a planar molecule whereas NCI₃ is pyramidal, because

(a)  B-Cl bond is more polar than N-Cl bond.

(b) N-CI bond is more covalent than B-Cl bond

(c) nitrogen atom is smaller than boron atoms 

(d) BCl₃ has no lone pair but NCI₃ has a lone pair of electrons.

Answer 1

Correct option (d) BCl₃ has no lone pair but NCI₃ has a lone pair of electrons.

Explanation:

As there is no lone pair on boron in BCl₃, therefore, no repulsion takes place. But there is a lone pair on nitrogen in NCl₃ therefore, repulsion takes place. Thus, BCl₃ is planar molecule but NCl₃ is pyramidal molecule.