Which of the following is a polar compound?

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(A) compound is considered polar if there is a significant difference in electronegativity between the bonded atoms,resulting in a permanent dipole mo

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$HF$

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(A) compound is considered polar if there is a significant difference in electronegativity between the bonded atoms,resulting in a permanent dipole moment.In the given options,all are polar,but $HF$ exhibits the highest degree of polarity due to the largest electronegativity difference between $H$ $(2.1)$ and $F$ $(4.0)$.Therefore,$HF$ is the most polar compound among the choices.

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