Which of the following compound is most reactive in electrophilic aromatic substitution?

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In Electrophilic Aromatic Substitution (EAS), the "speed" of the reaction depends on the electron density of the benzene ring. An electron-rich ring is "tastier" to the incoming electrophile ().

🗺️ Activating vs. Deactivating Groups
- (a) Phenol (-OH): The oxygen atom has lone pairs that it can donate into the ring through resonance (+R effect). This strongly increases the electron density at ortho and para positions, making it highly reactive (Strongly Activating

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