Q. No.The solution of a chemical compound (X) reacts with \(AgNO_3\) solution to form a white precipitate of (Y) which in turn dissolves in \(NH_4OH \) to give a complex (Z). When (Z) is treated with dilute \(HNO_3,\) (Y) reappears. The chemical compound X can be :
1. \(NaCl \)
2. \(CH_3Cl \)
3. \(NaBr \)
4. \(NaI \)
1. \(NaCl \)
2. \(CH_3Cl \)
3. \(NaBr \)
4. \(NaI \)
Subtopic: Â Detection of the functional groups |
 74%
Level 2: 60%+
Hints
Which reagent is commonly used for the detection of hydroxyl groups?
1. Sodium hydroxide (NaOH)
2. Bromine water (Br2)
3. Sodium bicarbonate (NaHCO3)
4. Ammonia (NH3)
1. Sodium hydroxide (NaOH)
2. Bromine water (Br2)
3. Sodium bicarbonate (NaHCO3)
4. Ammonia (NH3)
Subtopic: Â Detection of the functional groups |
 51%
Level 3: 35%-60%
Hints
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 |
 80%
Level 1: 80%+
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
Fehling's solution is used for the detection of which functional group?
1. Alcohol (-OH)
2. Amine (NH2)
3. Aldehyde (CHO)
4. Carboxylic acid (COOH)
1. Alcohol (-OH)
2. Amine (NH2)
3. Aldehyde (CHO)
4. Carboxylic acid (COOH)
Subtopic: Â Detection of the functional groups |
 90%
Level 1: 80%+
Hints
Which functional group is identified through the use of Lucas reagent?
1. Alcohol (-OH)
2. Ester (RCOO-)
3. Amine (NH2)
4. Aldehyde (CHO)
1. Alcohol (-OH)
2. Ester (RCOO-)
3. Amine (NH2)
4. Aldehyde (CHO)
Subtopic: Â Detection of the functional groups |
 92%
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
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
Which of the following reagents is NOT suitable for the detection of aldehydes?
1. Tollens' reagent
2. Fehling's solution
3. Schiff's reagent
4. Bromine water
1. Tollens' reagent
2. Fehling's solution
3. Schiff's reagent
4. Bromine water
Subtopic: Â Detection of the functional groups |
 82%
Level 1: 80%+
Hints
During salt analysis, which functional group produces a reddish-brown precipitate upon reaction with Fehling's solution?
1. Aldehyde
2. Ketone
3. Carboxylic acid
4. Ester
1. Aldehyde
2. Ketone
3. Carboxylic acid
4. Ester
Subtopic: Â Detection of the functional groups |
 88%
Level 1: 80%+
Hints
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