• # question_answer Which of the following can?t be used in Friedal Craft?s reactions [AFMC 2004] A) $FeC{{l}_{3}}$ B) $FeB{{r}_{2}}$ C) $AlC{{l}_{3}}$ D) NaCl

All cations are expected to act as Lewis acid since they are electron deficient in nature. However cation such as $N{{a}^{+}},\ {{K}^{+}}$ etc. (Inert gas configuration) have a very little tendency to accept electrons. Therefore they do not acts as lewis acids in friedel Craft?s reaction.