alleryThe Lewis-acid catalyst typically used in **Friedel–Crafts alkylation** is
A$AlCl_3$
B$NaOH$
C$KMnO_4$
D$H_2SO_4$
Answer & Solution
Correct answer: A. $AlCl_3$
Anhydrous $AlCl_3$ (or other Lewis acids like $FeCl_3$, $BF_3$) generates the electrophilic carbocation from $RX$ that attacks the arene.
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