In the sulphonation of benzene with fuming sulphuric acid, the attacking electrophile is ____.
Correct answer B. SO₃
Explanation
Fuming sulphuric acid contains dissolved SO₃. Its sulphur atom is strongly electron-deficient, so SO₃ acts as the electrophile, producing benzenesulphonic acid, C₆H₅SO₃H.
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