1. Tardigrade
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  4. In the following set of aromatic compounds <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/chemistry/a917a6d67f31cc7787f5a2675e534f72-.png /> The correct order of reactivity toward Friedel-Crafts alkylation is

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Q. In the following set of aromatic compounds
image
The correct order of reactivity toward Friedel-Crafts alkylation is

KVPYKVPY 2011

Solution:

The electron releasing groups attached to benzene increases the reactivity towards Friedel-Crafts alkylation whereas the electron withdrawing groups decreases the reactivity.
Among the given groups, $- NO _{2}$ and $COOCH _{3}$ are electron withdrawing group EWG, so they will decrease the reactivity where $NO _{2}$ shows stronger $-I$ effect than $COOCH _{3} .$ So, the reactivity of nitrobenzene towards Friedel-Craft alkylation will be least. $OCH _{3}$ is an electron donating group, so it will increasing the reactivity.
Thus, the order of reactivity towards Friedel-Craft alkylation is
(iv) > (ii) > (iii) > (i)