Initiation:Radicals are formed. Light supplies the energy to split a chlorine molecule. hv (light) 2C1 Propagation:A radical reacts to generate another radical. Step 1:A chlorine radical abstracts a hydrogen to generate an alkyl radical. H H H一 H一 C· +H一C H H methyl radical continues the chain Step 2:The alkyl radical reacts with Cl2 to generate the product and a chlorine radical. H H H-c个a-g H-C-CI H H chloromethane 2013 Pearson Education,nc