The major product of the reaction is:

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(C) The reaction is a Friedel-Crafts acylation of a substituted indane derivative. The substrate has a tert-butyl group and a gem-dimethyl group on th

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(C) The reaction is a Friedel-Crafts acylation of a substituted indane derivative. The substrate has a tert-butyl group and a gem-dimethyl group on the five-membered ring. The electrophile is the acetyl cation,$CH_3CO^+$,generated from $CH_3COCl$ and $AlCl_3$. The position of substitution is governed by the directing effects of the existing substituents and steric hindrance. The tert-butyl group is bulky and directs to the ortho/para positions,but the para position is blocked by the fused ring. The ortho position relative to the tert-butyl group is sterically hindered. The position para to the gem-dimethyl group is the most accessible and electronically favored for electrophilic aromatic substitution. Therefore,the acetyl group attaches to the position para to the gem-dimethyl group,which corresponds to the structure shown in option $C$.

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