The sulfonation of an aromatic ring with SO_3 and H_2SO_4 is reversible. That is, heating benzenesulfonic acid with H_2SO_4 yields benzene. Show the mechanism of the desulfonation reaction. What is the electrophile?
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Why is the major product in the sulphonation of aniline para-product, as the medium is acidic -nh2 group will be present as nh3+ group having a -I effect and meta directing power? -
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4.4: Nitration et sulfonation du benzène - Chemistry LibreTexts