Question

Arrange the following in the order of reactivity towards an electrophilic attack

• A. V > IV > III > II > I
• B. III > V > IV > II > I
• C. III > IV > V > II > I
• D. V > IV > III > I > II

Answer 1

The correct option is B III > V > IV > II > I

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