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: NCERT Class 12 Chemistry Part 2, Unit 9 'Amines'_
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