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Question

Arrange in order of decreasing trend towards electrophilic substitution reactions: Chlorobenzene (I), Benzene (II), toluene (III) anilinium chloride (IV)
  1. III> II > I > IV
  2. II > I > IV > III
  3. I > II > IV > III
  4. IV > I > II > III


Solution

The correct option is A III> II > I > IV
Reactivity towards electrophilic substitution reaction depends upon stability of arenium ion intermediate. Stability of arenium ion increases in the  presence of EDG group (causing +R, +I, H) and decreases in the  presence of EWG (causing -R, -I). So, the correct order will be III> II > I > IV

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