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Q. No.When synthesizing acetanilide from aniline, ice-cold water is introduced to the reaction mixture after heating to
1. dissolve acetanilide
2. initiate the reaction
3. neutralize the solution
4. wash the crude acetanilide
Subtopic: Preparation of the Organic and Inorganic compounds |
Level 3: 35%-60%
Hints
What are the characteristics of the crystals obtained after crystallization during the synthesis of acetanilide from aniline?
1. Yellow and irregularly shaped
2. White and needle-shaped
3. Blue and spherical
4. Red and cubic
Subtopic: Detection of the functional groups |
57%
Level 3: 35%-60%
Please attempt this question first.
Hints
What is observed visually when ammonium hydroxide and hydrochloric acid react?
| 1. | Red coloration | 2. | White fumes |
| 3. | Blue precipitate | 4. | No visible change |
Subtopic: Detection of Anions |
88%
Level 1: 80%+
Hints
Mark the correct representation of the compound that is formed when \(\mathrm{AgCl}\) reacts with ammonia:
| 1. | \(\left[\mathrm{Ag}\left(\mathrm{NH}_3\right)_2\right] \mathrm{Cl} \text { }\) | 2. | \(\left[\mathrm{Ag}\left(\mathrm{NH}_4\right)_2\right] \mathrm{Cl} \text { }\) |
| 3. | \(\left[\mathrm{Ag}\left(\mathrm{NH}_2\right)_2\right] \mathrm{} \text {Cl }\) | 4. | AgNO3 |
Subtopic: Detection of Anions |
73%
Level 2: 60%+
Hints
Which solvent is used to dissolve the mixture of o-nitroacetanilide and p-nitroacetanilide for separation?
1. Water
2. Ethanol
3. Acetone
4. Hexane
1. Water
2. Ethanol
3. Acetone
4. Hexane
Subtopic: Preparation of the Organic and Inorganic compounds |
51%
Level 3: 35%-60%
Hints
In the presence of zinc, what chemical process is hindered during the reaction involving aniline?
| 1. | Reduction | 2. | Oxidation |
| 3. | Hydrolysis | 4. | Polymerization |
Subtopic: Preparation of the Organic and Inorganic compounds |
59%
Level 3: 35%-60%
Hints
What is the primary reason for using a reflux condenser in organic chemistry experiments?
1. To accelerate the reaction rate
2. To maintain a constant temperature
3. To minimize contamination
4. To prevent evaporation of reactants or solvents
1. To accelerate the reaction rate
2. To maintain a constant temperature
3. To minimize contamination
4. To prevent evaporation of reactants or solvents
Subtopic: Preparation of the Organic and Inorganic compounds |
61%
Level 2: 60%+
Hints
What is the ratio of aniline and glacial acetic acid used to synthesize acetanilide from aniline?
1. 2:6
2. 1:5
3. 2:3
4. 1:1
1. 2:6
2. 1:5
3. 2:3
4. 1:1
Subtopic: Preparation of the Organic and Inorganic compounds |
63%
Level 2: 60%+
Hints
Mark the reaction that is incorrect regarding the confirmatory test for acetate ion:
| 1. |  |
| 2. |  |
| 3. |  |
| 4. |  |
Subtopic: Detection of the functional groups |
Level 3: 35%-60%
Hints
A salt gives MnO2 , a light greenish-yellow pungent gas and effervescence on heating with conc. \(\mathrm{H}_2 \mathrm{SO}_4\):
This indicates the ions present in the salt are:
1. \(\mathrm{I^{-}ions.} \)
2. \(\mathrm{Br^{-}ions.} \)
3. \(\mathrm{Cl^{-}ions.} \)
4. \(\mathrm{S^{2-}ions.} \)
This indicates the ions present in the salt are:
1. \(\mathrm{I^{-}ions.} \)
2. \(\mathrm{Br^{-}ions.} \)
3. \(\mathrm{Cl^{-}ions.} \)
4. \(\mathrm{S^{2-}ions.} \)
Subtopic: Detection of Anions |
68%
Level 2: 60%+
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