Question

$B{F}_{3}andN{F}_3$ both molecules are covalent, but $B{F}_3$ is non-polar and $N{F}_3$ is polar. Its reason is

• A. In uncombined state boron is metal and nitrogen is gas
• B. B - F bond has no dipole moment whereas N - F bond has dipole moment
• C. The size of boron atom is smaller than nitrogen
• D. BF₃ is planar whereas NF₃ is pyramidal

Answer 1

The correct option is D

BF₃ is planar whereas NF₃ is pyramidal

$B{F}_3$ is planar while $N{F}_3$ is pyramidal due to the presence of lone pair of electron on nitrogen in $N{F}_3$.