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Radical chlorination: spot the missing initiator

Single question

One-step radical chlorination of butane gives 2-chlorobutane (with some 1-chlorobutane byproduct). The structures and reagents are right. Check the conditions for whether the chain can even start.

Radical chain initiation
Why UV light or peroxide is required
Chain mechanism for halogenation

Find the flaw

Click the step that contains the flaw, or pick “No flaw” if you think every step is correct.

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