Condition for maximum yield of C2H5Cl is
C2H6(excess)+Cl2U.V.Light−−−−−−→
C2H6+Cl2Dark−−−−−−−→Room temp.
C2H6+Cl2(excess)UV Light−−−−−→
C2H6+Cl2UV.Light−−−−−−→
C2H6(excess)+Cl2U.V.Light−−−−−−→C2H5Cl+HCl Ethylchloride (Major product)