C-F is the most polar. You can find the polarity of a compound by finding electronegativities (an atom’s desire for an electron) of the atoms; Carbon has an electronegativity of 2.5, compared to Fluorine’s 4.0. Fluorine’s high electronegative pull is much greater than Carbon’s, so the sharing of electrons between C and F is unequal (basically Fluorine really, really wants any electrons that Carbon can share!)
F-F is nonpolar because the sharing of electrons between the two Fluorine atoms is equal.
So for your list of compounds, the level of polarity goes like this (from least to greatest):
F-F – nonpolar
N-F and Cl-F both are moderately polar
C-F highly polar
This chart may help you: http://en.wikipedia.org/wiki/Electronegativity
Hope that helps you!Source(s): Chemistry Class
No. Hydrogen bonds exist between two polar molecules that contain hydrogen. Polar molecules have partially positive and negative ends. In hydrogen bonds, the partially positive end of one polar molecule is attracted to the partially negative end of another polar molecule. Bonding between non-metals consists of two electrons shared between two atoms. In covalent bonding, the two electrons shared by the atoms are attracted to the nucleus of both atoms. Neither atom completely loses or gains electrons as in ionic bonding. There are two types of covalent bonding: 1. Non-polar bonding with an equal sharing of electrons. 2. Polar bonding with an unequal sharing of electrons. The number of shared electrons depends on the number of electrons needed to complete the octet. POLAR BONDING results when two different non-metals unequally share electrons between them. One well known exception to the identical atom rule is the combination of carbon and hydrogen in all organic compounds. The non-metal closer to fluorine in the Periodic Table has a greater tendency to keep its own electron and also draw away the other atom’s electron. It is NOT completely successful. As a result only partial charges are established. One atom becomes partially positive since it has lost control of its electron some of the time. The other atom becomes partially negative since it gains electron some of the time.