Question

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

• A. I < III < II
• B. III < II < I
• C. II < I < III
• D. III < I < II

Answer 1

The correct option is D III < I < II

$C{H}_3$ 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 $-COC{H}_3$ 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