Q. 13.7( 42 Votes )
How do you account for the formation of ethane during chlorination of methane?
Chlorination of methane takes place following a free radical chain mechanism. The whole reaction mechanism can be represented by the following three steps below: -
Step 1: Initiation:
The reaction begins with the homolytic cleavage of Cl – Cl bond as:
Step 2: Propagation:
In the second step, chlorine free radicals attack the methane molecules and break down the C–H bond to generate methyl radicals as:-
These methyl radicals react with other chlorine free radicals to form methyl chloride along with the liberation of a chlorine free radical.
Hence, methyl free radicals and chlorine free radicals set up a chain reaction. While HCl and CH3Cl are the major products formed, other higher halogenated compounds are also formed as:-
Step 3: Termination:
Formation of ethane is a result of the termination of chain reactions taking place as a result of the consumption of reactants as:-
Hence, by this process, ethane is obtained as a by-product of chlorination of methane.
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