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(C) The reaction is a Friedel-Crafts alkylation. The alkyl halide $CH_3-CH(CH_3)-CH_2Br$ reacts with $AlCl_3$ to form a primary carbocation,which unde

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$1-$methyl$-4-$($1$,$1$-dimethylethyl)benzene

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(C) The reaction is a Friedel-Crafts alkylation. The alkyl halide $CH_3-CH(CH_3)-CH_2Br$ reacts with $AlCl_3$ to form a primary carbocation,which undergoes a $1,2-$hydride shift to form a more stable tertiary carbocation,$(CH_3)_3C^+$. This tertiary carbocation acts as the electrophile and attacks the toluene ring. Since the $-CH_3$ group is ortho/para directing and the tert-butyl group is bulky,the para-substituted product is the major product due to less steric hindrance. The major product is $1-$methyl$-4-(1,1-$dimethylethyl$)$benzene.

The major product obtained in the reaction of toluene with $1-$bromo$-2-$methylpropane in the presence of anhydrous $AlCl_3$ is

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