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  4. Some meta-directing substituent's in electrophilic aromatic substitution are given here. Which one is most deactivating?

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Q. Some meta-directing substituent's in electrophilic aromatic substitution are given here. Which one is most deactivating?

NTA AbhyasNTA Abhyas 2022

Solution:

Here $-NO_{2}$ has max -I, -R effect so it is the most deactivating group and deactivating order is as follows
$-NO_{2}>-SO_{3}H>-CN>-COOH$