Question

Which of the following can't be used in Friedel-Crafts reaction?

• A. $ FeC{{l}_{3}} $
• B. $ FeB{{r}_{2}} $
• C. $ AlC{{l}_{3}} $
• D. $ NaCl $

Answer 1

Answer: (D)

$ FeC{{l}_{3}},FeB{{r}_{2}} $ and $ AlC{{l}_{3}} $ are used in Friedel-Crafts reaction because they act as Lewis acid since they are electron deficient in nature. However cations such as $ N{{a}^{+}},{{K}^{+}} $ have a very little tendency, to accept electrons due to inert gas configuration. Therefore, cant be used in Friedel-Craft reaction.