Which of the following can't be used in Friedal Craft's reactions

FeCl₃

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FeBr₂

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AlCl₃

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NaCl

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Solution

The correct option is 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.

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