1.

During monoalkylation of Benzene with CH_3Cl in presence of anhydrous AlCl_3, an excess ofC_6H_6 must be used because this will.

Answer»

Increase the CHANCE for collision between `CH_3^(+) and C_6H_6`
Decrease the collision betweeen `CH_3^(oplus) and C_6H_5CH_3`
both a and b
Decrease the chancefor collision between `CH_3^(oplus) and C_6H_6`

SOLUTION :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 andto minimize collision between `CH_2^(oplus) and C_6H_5CH_3`.


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