Which of the following metal halide has the highest ionic character?
(Here, $M$ is monovalent metal)

M I

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M C l

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M B r

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M F

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Solution

The correct option is D $M F$
According to Fajan's rule, as the size of anion increases ionic character of the compound decreases. Since the size of $F^{-}$ is the smallest among halides, $M F$ has the highest ionic character.
The order of ionic character among metal halides is:
$M F > M C l > M B r > M I$

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