The correct answer for above statement is:
d NF3
(+)NaCl(-) = 0 is linear and the charges cancel so its no polar
(+3)AlF3(-3) = 0 the charges cancel so its non polar
Br2 is a diatomic element and elements don't have charges so its non polar
NF3 the N has a lone pair of electrons (:) and so it will repel the fluorine's as fluorine is the most electronegative element there is an unbalance in the charges so NF3 is polar .
Explanation:
In a polar covalent attachment, the particles shared by the atoms absorb a larger amount of time, on the center, closer to the Oxygen nucleus than the Hydrogen nucleus. This is because of the geometry of the molecule and the numerous electronegativity difference between the Hydrogen atom and the Oxygen atom.
