Identify the reagent(s) 'A' and condition(s) for the reaction

Question

Canvas Classes · Accepted Answer

The reaction given shows an allylic substitution of cyclohexene to form 3-chlorocyclohexene.
Allylic chlorination requires free radical conditions, which are typically achieved using  in the presence of UV light (or elevated temperature, e.g., ).
Using  with dark and anhydrous  would lead to electrophilic substitution on an aromatic ring (if it were benzene), or addition in dark. With UV light, free radical allylic substitution is the major pathway.

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