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In ammonolysis the order of reactivity of alkyl halides is:

ARCl > RBr > RI
BRBr > RCl > RI
CRCl > RI > RBr
DRI > RBr > RCl
Answer & Solution
Correct answer: D. RI > RBr > RCl
1. The carbon halogen bond must break for substitution. 2. That bond is weakest for the iodide. 3. Hence iodide reacts fastest and chloride slowest. _Source: syllabus Chemistry Part 2, Unit 9 'Amines'_
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