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In class we discussed the chlorination of methane. Here is an alternate mechanism.

This mechanism is thought to be incorrect. What is the best reason for why it is incorrect?

(A) Step 1, the chain initiation step, is highly endothermic.

(B) Step 2, the first chain propagation step, is highly endothermic.

(C) Step 3, the second chain propagation step, is highly exothermic.

(D) Steps 4, 5, and 6, the chain termination steps are all highly exothermic.

(E) The overall reaction is exothermic.