The `BCl_3` is a polar molecule whereas `NCl_3` is pyramidal because

Options

A. `BCl_(3)` is a planar molecule whereas `NCl_(3)` has a lone pair of electrons
B. `B-Cl` bond is more polar than `N-Cl` bond
C. nitrogen atom is smaller than boron atom
D. `N-Cl` bond is more covalent than `B-Cl` bond

Answer

A

Explanation

In `BCL_(3),B` is `sp^(2)`-hybridised and no lone pair on `B`-atom. But in `NCl_(3)N` is `sp^(3)`-hybridised with one lone pair of electron. `:.BCl_(3)` is a planar molecule and `NCl_(3)` is pyramidal.