Answer
$CCl_4$ synthesis can be favoured by keeping a high ratio of $Cl_2$ as compared to methane. Likewise, $CH_3Cl$ synthesis can be favoured if the ratio of methane is much higher than $Cl_2$
Work Step by Step
$CCl_4$ synthesis can be favoured by keeping a high ratio of $Cl_2$ as compared to methane. Likewise, $CH_3Cl$ synthesis can be favoured if the ratio of methane is much higher than $Cl_2$