(a) In diffused sunlight, chlorination of methane takes place until all the the hydrogen atoms in methane are replaced by chlorine atoms. It results in a mixture of products composed of chloromethane, dichloromethane, trichloromethane (chloroform) and tetrachloromethane (carbon tetrachloride).
(b) The equations involved in chlorination are:
(c) The above reactions are substitution reactions. A reaction in which the hydrogen in the alkane molecule is replaced by another atom or group of atoms is called a substitution reaction.