3.Which of the following would you expect to be aromatic? A) C E Ans:B 兰fof红mi presence of resonance structures presence of conjugation Ans: 5.Which of the following reactions of aromatics is reversible? A)Nitration D)Sulfonation B)Bromination F-C acylation 6.What reagents are typically required to accomplish bromination of an aromatic ring? A)Br2+HBr D)Br2+FeBrs B)Br2+heat E)Br2+H2SOa C)Br2+light Ans:D Page2Page 2 3. Which of the following would you expect to be aromatic? A) B) C) D) E) Ans: B 4. The best experimental proof of aromaticity is A) a pleasant odor. D) presence of resonance structures. B) infrared CH absorption frequency. E) presence of conjugation. C) NMR chemical shifts. Ans: C 5. Which of the following reactions of aromatics is reversible? A) Nitration D) Sulfonation B) Bromination E) F-C acylation C) F-C alkylation Ans: D 6. What reagents are typically required to accomplish bromination of an aromatic ring? A) Br2 + HBr D) Br2 + FeBr3 B) Br2 + heat E) Br2 + H2SO4 C) Br2 + light Ans: D