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Question

The increasing order of the reactivity of the following compounds towards electrophilic aromatic substitution reactions is:

A
I < III < II
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B
III < II < I
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C
II < I < III
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D
III < I < II
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Solution

The correct option is D III < I < II
CH3 group when bonded to benzene increases the electron density of benzene ring due to +I and hyper conjugation effects. Cl group decreases the electron density of benzene ring due to I effect, and COCH3 group strongly decreases the electron density of benzene ring due to I and R effects. Therefore, correct increasing order of the given compounds towards electrophilic aromatic substitution is

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