Why fluoro benzene is more reactive than chlloro benzene?
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Fluorine donates its lone pair of electrons by resonance better than the chlorine atom because fluorine atom involves 2p-2p overlap, whereas chlorine atom involves 2p-3p.
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It is the stronger resonance contribution from this effective electron donating resonance interaction with fluorine that makes fluorobenzene more reactive towards electrophilic aromatic substitution than chlorobenzene.
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