- 1(current)
Q. No.Which functional group gives a positive test with 2,4-Dinitrophenylhydrazine (2,4-DNPH) reagent?
| 1. | Alcohol (-OH) | 2. | Ketone (C=O) |
| 3. | Carboxylic acid (COOH) | 4. | Ester (RCOO-) |
Subtopic: Â Detection of the functional groups |
 81%
Level 1: 80%+
Hints
Which reagent is used to distinguish between saturated and unsaturated hydrocarbons?
| 1. | Bromine water (Br2) | 2. | Silver nitrate (AgNO3) |
| 3. | Hydrochloric acid (HCl) | 4. | Potassium permanganate (KMnO4) |
Subtopic: Â Detection of the functional groups |
 73%
Level 2: 60%+
Hints
Which reagent from the options provided is capable of differentiating between aldehydes and ketones during salt analysis?
| 1. | Lucas test | 2. | Bromine water |
| 3. | 2,4-DNP test | 4. | Schiff's reagent |
Subtopic: Â Detection of the functional groups |
 60%
Level 2: 60%+
Hints
What color product is formed when a ketone reacts with the 2,4-Dinitrophenylhydrazine (2,4-DNPH) reagent?
1. Orange/green precipitate
2. Brown precipitate
3. White precipitate
4. Yellow/orange precipitate
1. Orange/green precipitate
2. Brown precipitate
3. White precipitate
4. Yellow/orange precipitate
Subtopic: Â Detection of the functional groups |
 79%
Level 2: 60%+
Hints
Subtopic: Â Detection of the functional groups |
Level 3: 35%-60%
Hints
What is formed when a carbonyl compound reacts with Tollens' reagent (ammoniacal silver nitrate)?
1. White precipitate
2. Red coloration
3. Silver mirror
4. Blue solution
1. White precipitate
2. Red coloration
3. Silver mirror
4. Blue solution
Subtopic: Â Detection of the functional groups |
 86%
Level 1: 80%+
Hints
- 1(current)
Q. No.
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