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(D) The ionic character of a bond is directly proportional to the difference in electronegativity between the bonded atoms. The electronegativity valu

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$SiCl_4$

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(D) The ionic character of a bond is directly proportional to the difference in electronegativity between the bonded atoms. The electronegativity values are: $Cl = 3.0$,$Si = 1.8$,$P = 2.1$,$B = 2.0$,and $C = 2.5$. The electronegativity differences are: $Si-Cl$: $|3.0 - 1.8| = 1.2$ $P-Cl$: $|3.0 - 2.1| = 0.9$ $B-Cl$: $|3.0 - 2.0| = 1.0$ $C-Cl$: $|3.0 - 2.5| = 0.5$ Since the $Si-Cl$ bond has the largest electronegativity difference,it possesses the highest ionic character.

The compound that has the highest ionic character associated with the $X-Cl$ bond is

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