Aromatic compounds such as benzene react with alkyl chlorides in the presence of A1C1₃ catalyst to yield alkylbenzenes. The reaction occurs through a carbocation intermediate, formed by reaction of the alkyl chloride with A1C1₃ (R-C1 + AlCl₃ ? R⁺ + A1C1₄^-). How can you explain the observation that reaction of benzene with 1-chioropropane yields isopropylbenzene as the major product?

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сз CHCH3 AICI3 CнзCH-CH2CI