5. What is the major product of the Friedel-Crafts alkylation of benzene with 1-butene and $\mathrm{AlCl}_3$?
(A) $n$-butylbenzene
(B) 2-phenylbutane
(C) 2-methyl-1-phenylpropane
(D) $t$-butylbenzene
(E) 2,2-diphenylbutane

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