- 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-)
1. Alcohol (-OH)
2. Ketone (C=O)
3. Carboxylic acid (COOH)
4. Ester (RCOO-)
Subtopic: Â Detection of the functional groups |
 82%
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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)
1. Bromine water (Br2)
2. Silver nitrate (AgNO3)
3. Hydrochloric acid (HCl)
4. Potassium permanganate (KMnO4)
Subtopic: Â Detection of the functional groups |
 73%
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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
1. Lucas test
2. Bromine water
3. 2,4-DNP test
4. Schiff's reagent
Subtopic: Â Detection of the functional groups |
 59%
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What is the product formed when a ketone reacts with 2,4-Dinitrophenylhydrazine (2,4-DNPH) reagent?
1. Orange/green precipitate
2. Silver mirror
3. White precipitate
4. Yellow/orange precipitate
1. Orange/green precipitate
2. Silver mirror
3. White precipitate
4. Yellow/orange precipitate
Subtopic: Â Detection of the functional groups |
 77%
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Subtopic: Â Detection of the functional groups |
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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 |
 87%
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Q. No.
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