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Question: Chlorination of methane does not occur in dark because....

Chlorination of methane does not occur in dark because.

A

Methane can form free radicals in presence of sunlight only.

B

To get chlorine free redicals from Cl2Cl_{2}molecules energy is required. It cannot happen in dark.

C

Substitution reaction can take place only in sunlight and not in dark.

D

Termination step cannot take place in dark. It requires sunlight.

Answer

To get chlorine free redicals from Cl2Cl_{2}molecules energy is required. It cannot happen in dark.

Explanation

Solution

: chlorination of methane is free radical substitution. To get chlorine free radical energy is required which is

Cl2→hυCl∙+Cl∙Cl_{2}\overset{\quad h\upsilon\quad}{\rightarrow}C\overset{\bullet}{l} + C\overset{\bullet}{l}