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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.
The greater the electronegativity difference between atoms in a bond, the more polar the bond. Partial negative charges are found on the most electronegative atoms, the others are partially positive. In general, the presence of an oxygen is more polar than a nitrogen because oxygen is more electronegative than nitrogen.