Question

29 multiple choice 2 points in the first propagation step of the free radical chlorination of methane, which of the following occurs? two chlorine radicals combine. cl₂ dissociates. a carbon radical reacts with a chlorine radical. a carbon radical reacts with cl₂ a chlorine radical abstracts a hydrogen.

Explanation:

Step1: Recall free - radical chlorination mechanism

In free - radical chlorination of methane, the first propagation step involves a chlorine radical ($\cdot$Cl) reacting with methane ($CH_4$).

Step2: Identify the reaction

The chlorine radical abstracts a hydrogen atom from methane to form hydrogen chloride ($HCl$) and a methyl radical ($\cdot$CH$_3$). The reaction is $\cdot$Cl + $CH_4$ $
ightarrow$ $HCl$+$\cdot$CH$_3$.

Answer:

E. A chlorine radical abstracts a hydrogen.