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The order of reactivities of methyl halides in the formation of Grignard reagent is
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$\mathrm{CH}_{3} \mathrm{I}>\mathrm{CH}_{3} \mathrm{Br}>\mathrm{CH}_{3} \mathrm{Cl}$
The order of reaction of methyl halides increases from fluorine to iodine due to decrease in $C-X$ bond strength.
$\therefore$ The order of reactivities of methyl halides in formation of Grignard reagent is
$$
\mathrm{CH}_{3} \mathrm{I}>\mathrm{CH}_{3} \mathrm{Br}>\mathrm{CH}_{3} \mathrm{Cl}
$$
$\therefore$ The order of reactivities of methyl halides in formation of Grignard reagent is
$$
\mathrm{CH}_{3} \mathrm{I}>\mathrm{CH}_{3} \mathrm{Br}>\mathrm{CH}_{3} \mathrm{Cl}
$$
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