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(C) The chlorination of ethane is a classic example of a free radical substitution reaction. It proceeds through three main stages:Step $I$: Initiatio

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Free radical substitution

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(C) The chlorination of ethane is a classic example of a free radical substitution reaction. It proceeds through three main stages:Step $I$: Initiation step,where chlorine molecules undergo homolytic fission in the presence of light $(hv)$ to form chlorine free radicals:$Cl_2 \stackrel{hv}{\longrightarrow} 2 Cl^{\bullet}$Step $II$: Propagation step,where the chlorine radical reacts with ethane to form an ethyl radical,which then reacts with another chlorine molecule to form chloroethane and regenerate a chlorine radical:$CH_3CH_3 + Cl^{\bullet} \longrightarrow CH_3CH_2^{\bullet} + HCl$$CH_3CH_2^{\bullet} + Cl_2 \longrightarrow CH_3CH_2Cl + Cl^{\bullet}$Step $III$: Termination step,where free radicals combine to end the chain reaction:$CH_3CH_2^{\bullet} + Cl^{\bullet} \longrightarrow CH_3CH_2Cl$$Cl^{\bullet} + Cl^{\bullet} \longrightarrow Cl_2$$2 CH_3CH_2^{\bullet} \longrightarrow CH_3CH_2CH_2CH_3$

The chlorination of ethane is an example of which of the following types of reactions?

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