Friedel–Crafts alkylation of benzene with $1$-chloropropane and $AlCl_…

Question

Friedel–Crafts alkylation of benzene with $1$-chloropropane and $AlCl_3$ gives, as the major product,

Accepted Answer

D. Isopropylbenzene (cumene)

The primary carbocation $CH_3CH_2CH_2^+$ rearranges (1,2-H shift) to the more stable secondary cation $(CH_3)_2CH^+$, which attacks benzene.
Carbocation rearrangement is the classic Friedel–Crafts alkylation pitfall — acylation avoids this because acylium ions don't rearrange.

Answer

n-Propylbenzene

Answer

1,2-Dipropylbenzene

Answer

Cyclopropylbenzene

Friedel–Crafts alkylation of benzene with $1$-chloropropane and $AlCl_3$ gives, as the major product,

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