Diazonium salts and their synthetic importance - Question Bank
1. The reaction of a diazonium salt with sodium nitrite in the presence of copper powder can introduce a nitro group into the aromatic ring. This is a variation of:
2. The Balz-Schiemann reaction is specifically used for the synthesis of:
3. Which of the following diazonium salt reactions results in the formation of nitrogen gas as a byproduct?
4. The synthesis of substituted benzoic acids from substituted anilines often involves diazotization followed by:
5. Which of the following is a characteristic property of diazonium salts that enables their use in coupling reactions?
6. The reaction of benzenediazonium chloride with sodium borohydride (NaBH₄) can lead to:
7. What is the primary reason for the synthetic utility of diazonium salts?
8. The Sandmeyer reaction is a method for the replacement of the diazonium group by:
9. Which reaction is most suitable for synthesizing fluorobenzene from aniline?
10. The conversion of a diazonium salt to an aryl boronic acid can be achieved using:
11. In the azo coupling reaction, the diazonium ion acts as an:
12. Which of the following diazonium salt reactions is used to introduce an iodine atom into an aromatic ring?
13. The coupling of a diazonium salt with a compound containing an active methylene group is possible under specific conditions. This is an example of:
14. The reason for the instability of diazonium salts is:
15. Which reagent is used to convert aniline to benzenediazonium chloride?
16. The synthesis of 4-bromobenzoic acid from 4-aminobenzoic acid involves:
17. What is the oxidation state of nitrogen in the diazonium group (-N₂⁺)?
18. The decomposition of diazonium salts in solution is an example of:
19. Diazonium salts are important intermediates in the synthesis of:
20. Which of the following is NOT a synthetic application of diazonium salts?
21. When benzenediazonium chloride is treated with ethanol, the major products are:
22. The reaction of diazonium salts with ethanol can lead to:
23. The replacement of the diazonium group by a hydrogen atom can be achieved using:
24. The reaction of benzenediazonium chloride with H₃PO₂ yields:
25. The reduction of diazonium salts with hypophosphorous acid (H₃PO₂) leads to the formation of:
26. When benzenediazonium chloride couples with aniline in a weakly acidic medium, the product formed is:
27. When benzenediazonium chloride couples with phenol in alkaline medium, the product formed is:
28. Azo compounds are known for their use as:
29. The product of an azo coupling reaction contains the characteristic functional group:
30. Azo coupling reactions are usually carried out in a medium that is:
31. Azo coupling reactions typically occur between a diazonium salt and:
32. The azo coupling reaction is characteristic of:
33. Which of the following is used in the Schiemann reaction to introduce fluorine into the aromatic ring?
34. In the Schiemann reaction, the diazonium salt is first treated with HBF₄ to form a diazonium tetrafluoroborate salt, which is then heated. This leads to the formation of:
35. The conversion of a diazonium salt to an aryl fluoride is known as the:
36. When benzenediazonium chloride reacts with CuCN/KCN, the product is:
37. The replacement of the diazonium group by a cyano group (-CN) can be achieved using:
38. The reaction of benzenediazonium chloride with potassium iodide (KI) yields:
39. When benzenediazonium chloride is heated with water, the primary product formed is:
40. The Gattermann reaction is similar to the Sandmeyer reaction but uses:
41. Which product is formed when benzenediazonium chloride reacts with CuBr/HBr?
42. Which product is formed when benzenediazonium chloride reacts with CuCl/HCl?
43. In the Sandmeyer reaction, what is the role of copper(I) halide (CuX)?
44. The Sandmeyer reaction involves the conversion of a diazonium salt to:
45. Which of the following is a characteristic property of diazonium salts in aqueous solution?
46. Why is the preparation of diazonium salts carried out at low temperatures (0-5 °C)?
47. The reaction of a primary aromatic amine with nitrous acid in the presence of a mineral acid at low temperature (0-5 °C) yields:
48. Diazonium salts are typically prepared from primary aromatic amines by treatment with:
49. Which of the following is the general formula for diazonium salts?