Detection of elements and functional groups hydroxyl carbonyl carboxyl and amino groups in organic compounds - One Line Questions

1. Which of the following reagents can be used to detect the presence of a carbonyl group (C=O) in general (aldehydes and ketones)? — 2,4-Dinitrophenylhydrazine
2. Which of the following compounds will give a positive test with Tollens' reagent? — Benzaldehyde
3. The sodium salt of a carboxylic acid can be prepared by reacting the acid with: — Basic reagents
4. Which functional group is responsible for the characteristic reactions of phenols with ferric chloride, producing a colored complex? — Phenolic -OH
5. The functional group -COOH characterizes which class of organic compounds? — Carboxylic acids
6. Secondary amines react with nitrous acid to form: — Nitrosoamines
7. Tertiary amines react with nitrous acid to form: — Salts of amines
8. Which functional group is characterized by the presence of a carbonyl group (C=O) bonded to two carbon atoms? — Ketone
9. Which type of aldehyde reacts with Fehling's solution to give a positive test? — Aliphatic aldehydes
10. The melting point of the derivative formed with 2,4-Dinitrophenylhydrazine can help in identifying a specific aldehyde or ketone because: — Each derivative has a unique melting point
11. Fehling's solution is another reagent used to test for aldehydes. It is a mixture of: — Aqueous solution of potassium hydroxide and alkaline copper sulfate
12. If both nitrogen and sulfur are present in an organic compound, the sodium fusion test will yield a precipitate that is: — Black
13. A pale yellow precipitate, sparingly soluble in ammonium hydroxide, in the halogen test indicates: — Bromine
14. A yellow precipitate, insoluble in ammonium hydroxide, in the halogen test signifies the presence of: — Iodine
15. In the carbylamine test, a foul-smelling isocyanide is formed when primary amines are heated with: — Chloroform and alcoholic KOH
16. Primary amines react with nitrous acid (HNO2) to form: — Alcohols and nitrogen gas
17. In the sodium fusion test for detecting elements in organic compounds, what is the fused mixture heated with? — Distilled water
18. Which of the following compounds will give effervescence with sodium bicarbonate? — Acetic acid
19. The presence of an amino group (-NH2) in an organic compound can be detected using: — Nitrous acid
20. Which test is specifically used to distinguish between aldehydes and alpha-hydroxy ketones, as both can reduce Tollens' reagent? — Iodoform test
21. How is the presence of sulfur detected in the sodium fusion test? — Formation of a violet color with sodium nitroprusside
22. Carboxylic acids can be detected by their reaction with sodium bicarbonate, which produces: — Carbon dioxide gas
23. The evolution of effervescence (bubbling) when an organic compound is treated with sodium bicarbonate solution is a strong indication of the presence of a: — Carboxylic acid group
24. Phenols react with Lucas reagent to give turbidity: — Not at all
25. A white precipitate, soluble in ammonium hydroxide, formed during the halogen test (sodium fusion) indicates the presence of: — Chlorine
26. A positive iodoform test is indicated by the formation of a yellow precipitate of: — Iodoform (CHI3)
27. The iodoform test is positive for compounds containing the CH3-CO- group or CH3-CH(OH)- group. This test involves reaction with: — Iodine and sodium hydroxide
28. 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: — Carboxylic acid
29. Tollens' reagent is used to test for the presence of: — Aldehydes
30. Which test is commonly used for the qualitative detection of nitrogen, sulfur, and halogens in organic compounds? — Sodium fusion test
31. Which reagent is used to detect the presence of a hydroxyl (-OH) group in an organic compound through esterification? — Acetic anhydride or acetyl chloride
32. Which test can be used to differentiate between aldehydes and ketones? — Tollens' test
33. Which of the following compounds will give a positive iodoform test? — Propan-2-ol
34. 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: — Esterification
35. 2,4-Dinitrophenylhydrazine reacts with both aldehydes and ketones to form characteristic crystalline precipitates known as: — Dinitrophenylhydrazones
36. For the detection of halogens using the sodium fusion test, the sodium halide is dissolved in water and then treated with: — Silver nitrate solution
37. Which type of alcohol reacts instantaneously with Lucas reagent to produce turbidity? — Tertiary alcohol
38. 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? — Secondary alcohol
39. The carbylamine test is used to detect the presence of: — Primary amines
40. Lucas reagent is a solution of anhydrous zinc chloride in concentrated hydrochloric acid, primarily used to distinguish between: — Primary, secondary, and tertiary alcohols
41. Which of the following compounds will give a positive iodoform test? — Butanone
42. Which of the following will produce nitrogen gas when treated with nitrous acid? — Primary aliphatic amine
43. A positive test with Fehling's solution (which consists of Fehling's solution A and B) results in the formation of a precipitate of: — Copper(I) oxide
44. When testing for nitrogen using the sodium fusion test, the sodium cyanide formed reacts with ferrous sulfate to produce: — Sodium ferrocyanide
45. A Prussian blue coloration in the sodium fusion test for nitrogen indicates the presence of: — Nitrogen
46. Ketones do not react with Tollens' reagent or Fehling's solution because: — They are already in a higher oxidation state
47. Secondary and tertiary amines do not give the carbylamine test because: — They do not contain a replaceable hydrogen atom on the nitrogen
48. 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: — They form unstable carbocations
49. Phenols typically produce a color with neutral ferric chloride solution. The color observed can be: — Green, blue, or violet
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