In which of the following reactions,t-butyl b | vedclass

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(A) The given reactions are analyzed as follows:$1.$ Friedel-Crafts alkylation of benzene with $t$-butyl chloride in the presence of $AlCl_3$ yields $

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$1, 2$ and $3$

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(A) The given reactions are analyzed as follows:$1.$ Friedel-Crafts alkylation of benzene with $t$-butyl chloride in the presence of $AlCl_3$ yields $t$-butyl benzene.$2.$ Benzene reacts with $2$-methylpropene (isobutylene) in the presence of $BF_3/HF$ to form $t$-butyl benzene via a carbocation intermediate.$3.$ Benzene reacts with $t$-butyl alcohol in the presence of $H_2SO_4$ to form $t$-butyl benzene through the formation of a $t$-butyl carbocation.$4.$ Benzene reacts with butanoyl chloride via Friedel-Crafts acylation to form $1$-phenylbutan-$1$-one. Subsequent Clemmensen reduction $(Zn/Hg, HCl)$ yields $n$-butylbenzene,not $t$-butyl benzene.Thus,reactions $1, 2,$ and $3$ produce $t$-butyl benzene.

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