Detection of elements and functional groups hydroxyl carbonyl carboxyl and amino groups in organic compounds - Question Bank
1. Which of the following compounds will give a positive iodoform test?
2. Which of the following compounds will give a positive iodoform test?
3. A positive iodoform test is indicated by the formation of a yellow precipitate of:
4. The iodoform test is positive for compounds containing the CH3-CO- group or CH3-CH(OH)- group. This test involves reaction with:
5. Which test is specifically used to distinguish between aldehydes and alpha-hydroxy ketones, as both can reduce Tollens' reagent?
6. The melting point of the derivative formed with 2,4-Dinitrophenylhydrazine can help in identifying a specific aldehyde or ketone because:
7. 2,4-Dinitrophenylhydrazine reacts with both aldehydes and ketones to form characteristic crystalline precipitates known as:
8. Which of the following reagents can be used to detect the presence of a carbonyl group (C=O) in general (aldehydes and ketones)?
9. The reaction of an alcohol with acetyl chloride or acetic anhydride is a test for the presence of the hydroxyl group, forming an ester. This reaction is an example of:
10. Phenols typically produce a color with neutral ferric chloride solution. The color observed can be:
11. Which functional group is responsible for the characteristic reactions of phenols with ferric chloride, producing a colored complex?
12. Secondary and tertiary amines do not give the carbylamine test because:
13. In the carbylamine test, a foul-smelling isocyanide is formed when primary amines are heated with:
14. The carbylamine test is used to detect the presence of:
15. Tertiary amines react with nitrous acid to form:
16. Secondary amines react with nitrous acid to form:
17. Which of the following will produce nitrogen gas when treated with nitrous acid?
18. Primary amines react with nitrous acid (HNO2) to form:
19. The presence of an amino group (-NH2) in an organic compound can be detected using:
20. Which of the following compounds will give effervescence with sodium bicarbonate?
21. The evolution of effervescence (bubbling) when an organic compound is treated with sodium bicarbonate solution is a strong indication of the presence of a:
22. Carboxylic acids can be detected by their reaction with sodium bicarbonate, which produces:
23. The functional group -COOH characterizes which class of organic compounds?
24. Which test can be used to differentiate between aldehydes and ketones?
25. The sodium salt of a carboxylic acid can be prepared by reacting the acid with:
26. Ketones do not react with Tollens' reagent or Fehling's solution because:
27. Which type of aldehyde reacts with Fehling's solution to give a positive test?
28. A positive test with Fehling's solution (which consists of Fehling's solution A and B) results in the formation of a precipitate of:
29. Fehling's solution is another reagent used to test for aldehydes. It is a mixture of:
30. Which of the following compounds will give a positive test with Tollens' reagent?
31. When Tollens' reagent reacts with an aldehyde, it forms a silver mirror on the inner walls of the test tube. This is due to the oxidation of the aldehyde to a:
32. Tollens' reagent is used to test for the presence of:
33. Which functional group is characterized by the presence of a carbonyl group (C=O) bonded to two carbon atoms?
34. Phenols react with Lucas reagent to give turbidity:
35. Primary alcohols react with Lucas reagent after a considerable delay or do not react at room temperature, showing turbidity only upon heating. This is because:
36. A cloudy solution that clears up on warming and becomes turbid on cooling is characteristic of the reaction of Lucas reagent with which type of alcohol?
37. Which type of alcohol reacts instantaneously with Lucas reagent to produce turbidity?
38. Lucas reagent is a solution of anhydrous zinc chloride in concentrated hydrochloric acid, primarily used to distinguish between:
39. Which reagent is used to detect the presence of a hydroxyl (-OH) group in an organic compound through esterification?
40. A yellow precipitate, insoluble in ammonium hydroxide, in the halogen test signifies the presence of:
41. A pale yellow precipitate, sparingly soluble in ammonium hydroxide, in the halogen test indicates:
42. A white precipitate, soluble in ammonium hydroxide, formed during the halogen test (sodium fusion) indicates the presence of:
43. For the detection of halogens using the sodium fusion test, the sodium halide is dissolved in water and then treated with:
44. If both nitrogen and sulfur are present in an organic compound, the sodium fusion test will yield a precipitate that is:
45. How is the presence of sulfur detected in the sodium fusion test?
46. A Prussian blue coloration in the sodium fusion test for nitrogen indicates the presence of:
47. When testing for nitrogen using the sodium fusion test, the sodium cyanide formed reacts with ferrous sulfate to produce:
48. In the sodium fusion test for detecting elements in organic compounds, what is the fused mixture heated with?
49. Which test is commonly used for the qualitative detection of nitrogen, sulfur, and halogens in organic compounds?