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Question: Answered & Verified by Expert
The order of reactivities of methyl halides in the formation of Grignard reagent is
ChemistryHaloalkanes and HaloarenesCOMEDKCOMEDK 2013
Options:
  • A $\mathrm{CH}_{3} \mathrm{I}>\mathrm{CH}_{3} \mathrm{Br}>\mathrm{CH}_{3} \mathrm{Cl}$
  • B $\mathrm{CH}_{3} \mathrm{Cl}>\mathrm{CH}_{3} \mathrm{Br}>\mathrm{CH}_{3} \mathrm{I}$
  • C $\mathrm{CH}_{3} \mathrm{Br}>\mathrm{CH}_{3} \mathrm{Cl}>\mathrm{CH}_{3} \mathrm{I}$
  • D $\mathrm{CH}_{3} \mathrm{Br}>\mathrm{CH}_{3} \mathrm{I}>\mathrm{CH}_{3} \mathrm{Cl}$
Solution:
1053 Upvotes Verified Answer
The correct answer is: $\mathrm{CH}_{3} \mathrm{I}>\mathrm{CH}_{3} \mathrm{Br}>\mathrm{CH}_{3} \mathrm{Cl}$
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
$$
\mathrm{CH}_{3} \mathrm{I}>\mathrm{CH}_{3} \mathrm{Br}>\mathrm{CH}_{3} \mathrm{Cl}
$$

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