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Which of the following compound is most reactive in electrophilic aromatic substitution?
A
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B
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C
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D
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Detailed Solution
The $-OH$ group in phenol is a strong activating, ortho/para-directing group (due to resonance donation of the lone pair into the ring), making phenol far more reactive towards electrophilic aromatic substitution than benzene, chlorobenzene (weakly deactivating) or nitrobenzene (strongly deactivating).