A possible reaction of ethane with chlorine is shown below. This reaction could conceivably occur by the following chain mechanisms [1],[2],and [3].The chain propagating step(s)is (are)________.

Question

A possible reaction of ethane with chlorine is shown below.  This reaction could conceivably occur by the following chain mechanisms [1],[2],and [3].The chain propagating step(s)is (are)________.

Quizplus · Accepted Answer

The chain propagating step(s) involve the formation of a free radical intermediate and the transfer of a hydrogen atom from the methane molecule to the chlorine molecule. This is seen in both mechanism [2] and [3]. Mechanism [1] does not involve the transfer of a hydrogen atom and therefore does not have a chain propagating step. Therefore, the correct answer is B, as it includes the two mechanisms that have chain propagating step(s).

A Possible Reaction of Ethane with Chlorine Is Shown Below