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Chlorobenzene is much less reactive than chloroethane toward nucleophilic substitution because:
AThe ring is too bulky for any incoming nucleophile
BCarbon in the ring is too electronegative to react here
CChlorine is more strongly bonded to the ring carbon centre
DResonance gives the C-Cl bond partial double bond character
Answer & Solution
Correct answer: D. Resonance gives the C-Cl bond partial double bond character
In chlorobenzene, lone-pair conjugation with the ring shortens and strengthens C-Cl, hindering substitution.
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