In this question, we have 3 different atoms, F, N and Ec, the electronegativity from all these atoms are 4.0, 3.4 and 3.0 respectively, and according to the rules of determining if a bond is polar or nonpolar, if the difference between electronegativity is greater than 0.5, we can have a polar bond, which is the case for this molecule, since we have a difference greater than 0.5, and since we can see that it is a polar bond, something that is usual among polar molecules is asymmetry, because the charges and electrons are being attracted to the most electronegative atom, therefore this is a polar molecule and asymmetric.
