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What is the correct order of reactivity of the following alkyl halides towards ammonolysis reaction?

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What is the correct order of reactivity of the following alkyl halides towards ammonolysis reaction?

(a) CH3I > CH3Br > CH3Cl

(b) CH3I > CH3Cl > CH3Br

(c) CH3Cl > CH3Br > CH3I

(d) CH3Br > CH3Cl > CH3I

I had been asked this question in final exam.

The origin of the question is Preparation of Amines in portion Amines of Chemistry – Class 12

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Correct answer is (a) CH3I > CH3Br > CH3Cl

Easy explanation: Iodine is the most electropositive atom of chlorine and bromine halogens. This makes it more susceptible to a nucleophilic attack than towards Cl or Br. Hence, CH3I is more reactive towards ammonolysis.

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