Question

The $BC{l}_3$ is planar molecule, whereas $NC{l}_3$ is a pyramidal because :

• A. $N-Cl$ bond more covalent bond than $B-Cl$ bond.
• B. $B-Cl$ bond is more polar than $N-Cl$ bond
• C. nitrogen atom is similar to boron atom.
• D. $BC{l}_3$ has no lone pair but $NC{l}_3$ has a lone pair or electrons.

Answer 1

Answer: (D)

$BC{l}_3$ has no lone pair but $NC{l}_3$ has a lone pair or electrons.

Boron trichloride is a planar molecular because it contains $3$ bond pairs and zero lone pairs. It undergoes $s{p}^2$ hybridization.
Nitrogen trichloride is pyramidal as it has $3$ bond pairs and one lone pair. It undergoes $s{p}^3$ hybridization.