The molecule with the most polar bond is:

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(D) The polarity of a bond depends on the difference in electronegativity between the bonded atoms. The electronegativity values (Pauling scale) are:

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$SiF_4$

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(D) The polarity of a bond depends on the difference in electronegativity between the bonded atoms. The electronegativity values (Pauling scale) are: $O = 3.44$,$F = 3.98$,$S = 2.58$,$Cl = 3.16$,and $Si = 1.90$. Calculating the differences: $OF_2$: $|3.98 - 3.44| = 0.54$ $SF_4$: $|3.98 - 2.58| = 1.40$ $ClF$: $|3.98 - 3.16| = 0.82$ $SiF_4$: $|3.98 - 1.90| = 2.08$ The bond with the maximum difference in electronegativity is the $Si-F$ bond in $SiF_4$.

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