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We did an experiment called oxidation of toluene. Please help with this example quiz question After...

We did an experiment called oxidation of toluene. Please help with this example quiz question

After refluxing the suspension of toluene in alkaline KMnO4, the reaction mixture was treated sequentially with sulfuric acid and oxalic acid to isolate benzoic acid. What was the role of sulfuric acid?

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