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The bond with the greatest polarity is due to the highest electronegativity difference between nitrogen and fluorine.

1. Nitrogen-chlorine (N—Cl)
2. Oxygen-fluorine (O—F)
3. Nitrogen-fluorine (N—F)
4. Nitrogen-nitrogen (N—N)

Correct answer: Nitrogen-fluorine (N—F)

Solution

The bond between N and F is the most polar because the electronegativity difference between nitrogen (N) and fluorine (F) is the highest among the given options. Fluorine is the most electronegative element.

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