The ionic character of M-X bond decreases in the order of :

M-F > M-Cl > M-Br > M-l

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M-l > M-Br > M-Cl > M-F

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M-Cl > M-Br > M-F > M-l

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M-F > M-l > M-Br > M-Cl

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Solution

The correct option is C M-F > M-Cl > M-Br > M-l
The extent of ionic character in a covalent bond depends upon the difference in electronegativity of the two atoms forming a bond. Larger the difference in the electronrgativity of the covalent bonds and consecutively greater is the polarity in the molecule. Electronegativity order of $F, C l, B r, I$ is $- F > C l > B r > I$ .
Therefore ionic character decreases in the order of-
$M - F > M - C l > M - B r > M - I$ .

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