The most polar bond is

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(A) The polarity of a covalent bond is directly proportional to the electronegativity difference between the bonded atoms.In the given options,carbon

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$C-F$

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(A) The polarity of a covalent bond is directly proportional to the electronegativity difference between the bonded atoms.In the given options,carbon is common to all bonds.The electronegativity values of the atoms are: $F (4.0) > O (3.5) > N (3.0) > C (2.5)$.The electronegativity difference for $C-F$ is $4.0 - 2.5 = 1.5$,which is the highest among the given options.Therefore,the $C-F$ bond is the most polar.

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