Answer:
Chlorination
of methane proceeds by free radical mechanism.
Initiation step:
Propagation step:
Termination step:
\[\underset{Methyl\,free\,radical}{\mathop{\overset{\centerdot
}{\mathop{C}}\,{{H}_{3}}+\overset{\centerdot }{\mathop{C}}\,{{H}_{3}}}}\,\to
\underset{Ethane}{\mathop{C{{H}_{3}}-C{{H}_{3}}}}\,\]
Two \[\overset{\centerdot }{\mathop{C}}\,{{H}_{3}}\] free
radicals combine together to formethane molecule.
\[\overset{\centerdot
}{\mathop{C}}\,{{H}_{3}}+\overset{\centerdot }{\mathop{Cl}}\,\to C{{H}_{3}}-Cl\]
\[\overset{\centerdot }{\mathop{Cl}}\,+\overset{\centerdot
}{\mathop{Cl}}\,\to C{{l}_{2}}\]
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