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Carbon is least electronegative so its attraction for electrons will be least so it will have a greater positive charge and alternatively fluorine will have a greater negative charge, so F-C bond is most polar. In F-N ,nitrogen will have lesser positive charge than carbon and fluorine will have a lesser negative charge as compared to in F-C and so on.
Best Answer: A polar covalent bond is a bond between two non-metals with different electronegativities. Only bonds between the same elements are truly nonpolar.The higher the difference in electronegativity, the more polar the bond is.Take a look at this table of electronegavities and let's try some examples. http://www.tutor-homework.com/Chemistry_...f an electron pair is 50/50 shared between two atoms, then the bond is non-polar, and covalent. If the electron pair moves a bit towards the more electronegative atom of the pair, it becomes polar covalent.