Question

The $BCl_{3}$is a planar molecule whereas $NCl_{3}$is pyramidal, because.

• A. B-Cl bond is more polar than N-Cl bond
• B. N-Cl bond is more covalent than B-Cl bond
• C. Nitrogen atom is smaller than boron atoms
• D. $BCl_{3}$has no lone pair but $NCl_{3}$has a lone pair of electrons.

Answer 1

Answer: (D)

$BCl_{3}$has no lone pair but $NCl_{3}$has a lone pair of electrons.

Answer 2

$BCl_{3}$

(central B atom)

No lone pair of electrons is available in $BCl_{3}$

$NCl_{3}$: (central N atom)

One lone pair of electrons is available on N atom, it occupies a corner in the tetrahedral arrangement.

Therefore, $NCl_{3}$appears pyramidal in shape.