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Let's solve these **step by step**. These are all classic reactions in organic chemistry. ### **(i) Benzene + H₂SO₄ + SO₃** This is **electrophilic aromatic substitution**: **sulfonation of benzene**. * Reagents: Concentrated H₂SO₄ + ____ _________ ____ _________ ________ ______ ___ __________ ___.
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