Answer:
The correct order of reactivity in electrophilic substitution is:
The electrophile attack will be the easiest in case the ring is maximum activated out of the groups attached in different molecules.
• \['C{{H}_{3}}'\] is highly activating due to hyper conjugation.
• \['Cl'\] is activating due to resonance (R) effect but at the same time it is deactivating due to\[-I\] effect.
• \['N{{O}_{2}}'\]is deactivating in nature.
In the light of the above observations, the order of reactivity is justified.
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