Question

$BF_{3}$ and $NF_{3}$both molecules are covalent, but $BF_{3}$ is non-polar and $NF_{3}$ 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. $BF_{3}$ is planar whereas $NF_{3}$ is pyramidal

Answer 1

Answer: (D)

$BF_{3}$ is planar whereas $NF_{3}$ is pyramidal

Answer 2

$BF_{3}$ is planar while $NF_{3}$ is pyramidal due to the presence of lone pair of electron on nitrogen in $NF_{3}$.