What electrophile attacks the benzene ring during nitration with a mixture of concentrated HNO₃ and H₂SO₄?
Correct answer D. NO₂⁺
Explanation
Concentrated sulphuric acid protonates nitric acid, which loses water to form the nitronium ion, NO₂⁺, the electrophile in nitration. It attacks the electron-rich benzene ring.
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