Question

In Friedel-Craft's reaction, anhydride. $AlC{l}_3$ acts to:

• A. produce electrophile
• B. produce nucleophile
• C. absorb water
• D. absorb HCl

Answer 1

Answer: (A)

During Friedel-Craft reaction alkyl or acyl group replaces hydrogen of benzene ring. Anhydrous $AlC{l}_3$ produces electrophile.
$RCl+\underset{\text{ Anhy}.AlC{l}_3}{AlC{l}_3}\rightleftharpoons R^{+}+\underset{\text{ Electrophile }}{AlC{l}_4^{-}}$
$R^{+}+C_6{H}_6⟶C_6{H}_{5}Cl+H^{+}$
$AlC{l}_4^{-}+H^{+}⟶AlC{l}_3+HCl$