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(C) The chlorination of ethane is a classic example of a free radical substitution reaction. It proceeds through a chain mechanism involving three mai

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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 a chain mechanism involving three main steps:$1.$ Initiation: The homolytic cleavage of $Cl_2$ by ultraviolet light $(h
u)$ to form chlorine free radicals.$Cl_2 \xrightarrow{h
u} 2Cl^{\bullet}$$2.$ Propagation: The chlorine radical abstracts a hydrogen atom from ethane to form an ethyl radical $(CH_3CH_2^{\bullet})$,which then reacts with another $Cl_2$ molecule to form ethyl chloride and regenerate a chlorine radical.$CH_3CH_3 + Cl^{\bullet} ightarrow CH_3CH_2^{\bullet} + HCl$$CH_3CH_2^{\bullet} + Cl_2 ightarrow CH_3CH_2Cl + Cl^{\bullet}$$3.$ Termination: The combination of any two free radicals to end the chain reaction.$CH_3CH_2^{\bullet} + Cl^{\bullet} ightarrow CH_3CH_2Cl$$Cl^{\bullet} + Cl^{\bullet} ightarrow Cl_2$$2CH_3CH_2^{\bullet} ightarrow CH_3CH_2CH_2CH_3$

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

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