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(B) Electrophilic substitution reaction involves the replacement of a hydrogen atom on an aromatic ring by an electrophile. In the reaction of benzene

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$C_6H_6 + Cl_2 \xrightarrow{AlCl_3} C_6H_5Cl + HCl$

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(B) Electrophilic substitution reaction involves the replacement of a hydrogen atom on an aromatic ring by an electrophile. In the reaction of benzene with chlorine in the presence of a Lewis acid like anhydrous $AlCl_3$,the electrophile $Cl^+$ is generated,which attacks the benzene ring to form chlorobenzene. This is a classic example of electrophilic aromatic substitution. Reaction: $C_6H_6 + Cl_2 \xrightarrow{Anhyd. AlCl_3} C_6H_5Cl + HCl$.

Among the following,the reaction that proceeds through an electrophilic substitution is

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Explain why aryl halides are extremely less reactive towards nucleophilic substitution reactions.

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