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(C) The reaction involves the electrophilic aromatic substitution of a polycyclic aromatic hydrocarbon (specifically,a derivative of $9,10-$dihydroant

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(C) The reaction involves the electrophilic aromatic substitution of a polycyclic aromatic hydrocarbon (specifically,a derivative of $9,10-$dihydroanthracene or similar structure) with $Br_2$ in the presence of a Lewis acid catalyst,$AlCl_3$.$1$. The $AlCl_3$ acts as a Lewis acid to generate the electrophile $Br^+$ from $Br_2$.$2$. The electrophile $Br^+$ attacks the most electron-rich position on the aromatic ring.$3$. In the given structure,the aromatic rings are activated towards electrophilic substitution. The position para to the alkyl group (or the most sterically accessible and electronically favored position) is typically preferred.$4$. Comparing the options,the substitution occurs at the position that minimizes steric hindrance while maintaining the stability of the intermediate carbocation (sigma complex).$5$. Option $C$ represents the substitution at the position para to the bridgehead,which is electronically favored due to the resonance stabilization provided by the fused ring system.

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