Radical Halogenation of Alkanes If there is more than one type of hydrogen in an alkane,the reaction favors replacing the hydrogen at the most highly substituted carbons CI Dichloro-, CHCH2CH2CHa +Cl2 CH CH,CH2CH2CI CH CH2CHCH+ trichloro-, tetrachloro-. Butane 1-Chlorobutane 2-Chlorobutane and so on 30:70 2004 Thomson-Brooks/Cole H H R R一C一H H Primary Secondary Tertiary 1.0 3.5 5.0 Reactivity oo4nws-seRadical Halogenation of Alkanes If there is more than one type of hydrogen in an alkane, the reaction favors replacing the hydrogen at the most highly substituted carbons