$$BF_{3}$$ and $$NF_{3}$$ both are covalent compounds but $$NF_{3}$$ is polar whereas $$BF_{3}$$ is non-polar. This is because :
A
Nitrogen atom is smaller than boron atom
B
$$N - F$$ bond is more polar than $$B - F$$ bond
C
$$BF_{3}$$ is electron deficient whereas $$NF_{3}$$ is not
D
$$NF_{3}$$ is pyramidal whereas $$BF_{3} $$ is planar triangular
Correct option is C. $$NF_{3}$$ is pyramidal whereas $$BF_{3} $$ is planar triangular