Nitronium ion is___________________?
Correct answer: D. NO2+
- A. NO3
- B. NO
- C. NO2-
- D. NO2+
Explanation
The nitronium ion is NO2+, formed in the nitrating mixture from nitric acid and sulfuric acid, and it acts as the electrophile in benzene nitration. The likely mistake is NO2-, but that is the nitrite ion and has the opposite charge.
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About Benzene and Aromatic Compounds
Benzene has a planar ring of delocalised π electrons, giving aromatic stability and equal carbon-carbon bond lengths. The topic covers resonance, electrophilic substitution reactions such as nitration, halogenation, sulphonation and Friedel-Crafts reactions, along with substituent effects and the distinction between substitution in benzene and addition in ordinary alkenes.
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