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Which one of the following is most polar?

1. \( C l-C l \)
2. \( N-F \)
3. \( C-F \)
4. \( O-F \)

Correct answer: \( C-F \)

Solution

Bond polarity increases as the electronegativity difference between the two atoms increases. Among the choices, carbon and fluorine have a large enough difference to make the bond highly polar, and it is greater than the differences in the other listed bonds.

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