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Give reason for the following : In mon...

Give reason for the following :
In monoalkylation of benzene with an alkyl halide and `AlCl_3`, an excess of benzene is used.

Text Solution

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In absence of excess benzene, polyalkylation takes place. However, when excess of benzene is used, benzene favours monoalkylation by increasing the chance for collision between `R^+` and benzene and prevents polyalkylation between `R^+` and `C_6H_5R`.
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