During monoalkylation of Benzene with `CH_3Cl` in presence of anhydrous `AlCl_3`, an excess of `C_6H_6` must be used because this will.

Options

A. Increase the chance for collision between `CH_3^(+) and C_6H_6`
B. Decrease the collision betweeen `CH_3^(oplus) and C_6H_5CH_3`
C. both a and b
D. Decrease the chance for collision between `CH_3^(oplus) and C_6H_6`

Answer

C

Explanation

Since `CH_3` group is an activating group , the mono methylated product is more reactive than benzene itself leading to formation of `C_6H_4(CH_3)_2 and C_6H_3(CH_3)_3`. Excess of `C_6H_6` is used to increase the chance for collision between and to minimize collision between `CH_2^(oplus) and C_6H_5CH_3`.