Propagation Step:Product Formation Second propagation step H H H- C-CI H H methyl radical chlorine molecule chloromethane chlorine atom Copyright2010 Pearson Prentice Hall,Inc. The methyl free radical collides with another chlorine molecule,producing the organic product(methyl chloride)and regenerating the chlorine radical. Chapter 4 7Chapter 4 7 Propagation Step: Product Formation The methyl free radical collides with another chlorine molecule, producing the organic product (methyl chloride) and regenerating the chlorine radical