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Final answer:The best reagent to complete the given reaction would be Br₂ (Option b).Explanation:In organic chemistry, reactions often involve halogenation, where a halogen atom is added to a molecule. The choice of halogen reagent depends on the specific reaction requirements. Among the options provided (I₂, Br₂, Cl₂, F₂), bromine (Br₂) is commonly used for halogenation reactions due to its moderate reactivity and selectivity.Bromination reactions are frequently employed in synthetic chemistry to introduce bromine atoms into organic molecules, and Br₂ is readily available and relatively safe to handle compared to other halogens like iodine and chlorine (Option b).Additionally, bromination reactions typically proceed smoothly under mild conditions, making Br₂ a versatile and practical choice for halogenation reactions. Therefore, in the absence of specific reaction requirements, Br₂ would be the most suitable reagent to complete the given reaction....