During sulphonation of benzene, H2SO4 generates the electrophile
Correct answer: C. SO3
- A. HSO-
- B. SO2
- C. SO3
- D. H+
Explanation
The electrophile generated during the sulfonation of benzene by H2SO4 is SO3. The concentrated sulfuric acid dissociates to form hydronium ions (H+) and sulfate ions (SO42-). The hydronium ions react with the sulfur trioxide molecules to form the sulfonium ion (SO3H+). The sulfonium ion then attacks the benzene ring, displacing a hydrogen atom and forming a sulfonic acid.
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Hydrocarbons are studied through the structures and reactions of alkanes, alkenes, alkynes and aromatic compounds. Coverage includes free radical substitution in alkanes, electrophilic addition to carbon-carbon multiple bonds, benzene substitution, aromatic stability and the difference between addition reactions of alkenes and substitution reactions of benzene.
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