The major product of the reaction is

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(A) The reaction is a Friedel-Crafts acylation of a substituted benzene ring. The substrate is $1,1,3$-trimethylindane (or a similar derivative). The

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(A) The reaction is a Friedel-Crafts acylation of a substituted benzene ring. The substrate is $1,1,3$-trimethylindane (or a similar derivative). The incoming electrophile is the acetyl cation,$CH_3CO^+$,generated from $CH_3COCl$ and $AlCl_3$. The substitution occurs at the position that is most activated and least sterically hindered. In the given structure,the position ortho to the alkyl group on the benzene ring is the most favorable site for electrophilic aromatic substitution due to the activating effect of the alkyl groups and the relative lack of steric hindrance compared to other positions. Therefore,the acetyl group attaches to the carbon atom that is ortho to the $tert$-butyl group and meta to the other alkyl group,which corresponds to the structure shown in option $A$.

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