Organic Chemistry :Order Of Reactivity Problem
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Furan undergoes ring opening upon treatment with sulfuric acid; it reacts almost explosively with halogens. However, 2-furoic acid, shown below, can be sulfonated (in the 5-position) via treatment with fuming sulfuric acid, and brominated (in the S-position) via treatment with bromine at 100. Could you please explain this difference in reactivity?
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