Question

$NF _{3}$ and $BF _{3}$ both are covalent, but $BF _{3}$ is non-polar, while $NF _{3}$ is polar because :

• A. Boron is non metal in free state, while $N _{2}$ is gas
• B. There is no dipole moment in $ B-F $ bond while $ N-F $ bond have some dipole moment.
• C. $BF _{3}$ is planar while $NF _{3}$ is pyramidal
• D. Boron atom is smaller than nitrogen atom

Answer 1

Answer: (B)

$NF _{3}$ and $BF _{3}$ both are covalent but $BF _{3}$ is non polar, while $NF _{3}$ is polar because there is no dipole moment in $BF$ bond while $NF$ bond have some dipole moment.