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

What is the correct order of reactivity of the following alkyl halides towards ammonolysis reaction? Correct Answer CH3I > CH3Br > CH3Cl

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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