Which of the following is a highly polar bond?

O - H

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N - H

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H - C l

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H - F

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Solution

The correct option is D $H - F$
The one in which the electronegativity difference is maximum will have the highest polarity. All options have hydrogen atom with different halogen atoms attached to them. Fluorine has the highest electronegativity value, therefore, $H - F$ will have the highest polarity.

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