Question

$B{F}_3$ and $N{F}_3$ 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. $B{F}_3$ is planar whereas $N{F}_3$ is pyramidal

Answer 1

The correct option is D $B{F}_3$ is planar whereas $N{F}_3$ is pyramidal

$B{F}_3$ has number lone pair and planardipole moment $\mu =0$
$N{F}_3$ has polar bond and pyramidal $\ne O$