JEE Main Chemistry question

The order of reactivity of methyl halides in the formation of a Grignard reagent is

(A)CH_3I > CH_3Br > CH_3ClCorrect
(B)CH_3Cl > CH_3Br > CH_3I
(C)CH_3Br > CH_3Cl > CH_3I
(D)CH_3Br > CH_3I > CH_3Cl

Answer: (A)

Solution

Formation of a Grignard reagent requires insertion of magnesium into the carbon–halogen bond, which is easier the weaker (and more polarisable) that bond is. Since C–I is

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Question ID VK-148044