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Q. No.Which functional group is identified using Lucas reagent?
1. Alcohol (-OH)
2. Ester (RCOO-)
3. Amine (NH2)
4. Aldehyde (CHO)
Subtopic: Detection of the functional groups |
90%
Level 1: 80%+
Hints
Which gas is evolved when carboxylic acids react with carbonates or bicarbonates?
1. Oxygen (O2)
2. Carbon dioxide (CO2)
3. Hydrogen (H2)
4. Nitrogen (N2)
1. Oxygen (O2)
2. Carbon dioxide (CO2)
3. Hydrogen (H2)
4. Nitrogen (N2)
Subtopic: Detection of Anions |
91%
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: Detection of the functional groups |
72%
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: Detection of the functional groups |
78%
Level 2: 60%+
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: Detection of the functional groups |
86%
Level 1: 80%+
Hints
What specific indication suggests the presence of an aldehyde group when reacting with 2,4-dinitrophenylhydrazine (DNPH)?
1. Formation of a silver mirror
2. Formation of a yellow-orange precipitate
3. Liberation of a gas with effervescence
4. No observable reaction
1. Formation of a silver mirror
2. Formation of a yellow-orange precipitate
3. Liberation of a gas with effervescence
4. No observable reaction
Subtopic: Detection of the functional groups |
81%
Level 1: 80%+
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: Detection of the functional groups |
58%
Level 3: 35%-60%
Hints
Subtopic: Preparation of the Organic and Inorganic compounds |
61%
Level 2: 60%+
Hints
Which of the following best describes the appearance of solid Mohr's salt?
1. Yellow powder
2. Green crystals
3. Blue granules
4. Colourless flakes
1. Yellow powder
2. Green crystals
3. Blue granules
4. Colourless flakes
Subtopic: Preparation of the Organic and Inorganic compounds |
57%
Level 3: 35%-60%
Hints
What is the purpose of the borax bead test?
1. To identify the presence of specific metallic ions
2. To determine the acidity of a solution
3. To test for the presence of organic compounds
4. To measure the concentration of a solute
1. To identify the presence of specific metallic ions
2. To determine the acidity of a solution
3. To test for the presence of organic compounds
4. To measure the concentration of a solute
Subtopic: Detection of extra elements |
78%
Level 2: 60%+
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