A) \[FeC{{l}_{3}}\]
B) \[FeB{{r}_{2}}\]
C) \[AlC{{l}_{3}}\]
D) \[NaCl\]
Correct Answer: D
Solution :
\[FeC{{l}_{3}},FeB{{r}_{2}}\]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.
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