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Q. No.During Lassaigne's test, the elements present in an organic compound are converted from:
| 1. | Covalent form to covalent form |
| 2. | Ionic form to ionic form |
| 3. | Covalent form to ionic form |
| 4. | Ionic form to covalent form |
Subtopic: Qualitative Analysis of Organic Compounds |
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Subtopic: Structural Isomers | Conformational Isomers |
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The correct IUPAC name of the following compound is:
1. 2,4-diethylhexane
2. 3,5-diethylhexane
3. 3-ethyl-5-methylheptane
4. 3-methyl-5-ethylheptane
1. 2,4-diethylhexane
2. 3,5-diethylhexane
3. 3-ethyl-5-methylheptane
4. 3-methyl-5-ethylheptane
Subtopic: Nomenclature |
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Given below are two statements:
In the light of the above statements, choose the most appropriate answer from the options given below.
| Statement I: | trans-But-2-ene upon treatment with Br2 in CCl4 gives the following product. |
| Statement II: | cis-But-2-ene upon treatment with alkaline KMnO4 gives the following product. |
In the light of the above statements, choose the most appropriate answer from the options given below.
| 1. | Statement I is incorrect but Statement II is correct |
| 2. | Both Statement I and Statement II are correct |
| 3. | Both Statement I and Statement II are incorrect |
| 4. | Statement I is correct but Statement II is incorrect |
Subtopic: Nomenclature | Structural Isomers | Conformational Isomers |
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Arrange the following compounds in the increasing order of polarity :
Choose the correct answer from the options given below.
| A. | \(CH_3CH_2OCH_2CH_3\) |
| B. | \(CH_3CH_2OH\) |
| C. | \(CH_3COCH_3\) |
| D. | \(CH_3COOH\) |
| 1. | A < C < B < D |
| 2. | A < B < C < D |
| 3. | C < A < D < B |
| 4. | C < A < B < D |
Subtopic: Aromaticity & Polarity |
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Among the following, the compound having conjugated double bonds is :
| 1. | hepta-1,6-diene |
| 2. | hepta-1,3-diene |
| 3. | hepta-1,4-diene |
| 4. | hepta-1,5-diene |
Subtopic: Aromaticity & Polarity |
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Consider the following reaction sequences and choose the correct option:
| 1. | M and N are stereoisomers |
| 2. | K and L are geometrical isomers |
| 3. | K and L are enantiomers |
| 4. | M and N are geometrical isomers |
Subtopic: Structural Isomers | Stereo Isomers |
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Which one of the following reactions does not belong to "Lassaigne's test"?
| 1. | \(\mathrm{Na}+\mathrm{X} \underset{\Delta}{\longrightarrow}+\mathrm{NaX} \) |
| 2. | \(2 \mathrm{CuO}+\mathrm{C} \xrightarrow[\Delta]{} 2 \mathrm{Cu}+\mathrm{CO}_2 \) |
| 3. | \(\mathrm{Na}+\mathrm{C}+\mathrm{N} \xrightarrow[\Delta]{} \mathrm{NaCN} \) |
| 4. | \(2 \mathrm{Na}+\mathrm{S} \xrightarrow[\Delta]{} \mathrm{Na}_2 \mathrm{~S}\) |
Subtopic: Qualitative Analysis of Organic Compounds |
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NEET - 2025
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Match List-I with List-II:
Choose the correct answer from the option given below:
1. A-III, B-IV, C-I, D-II
2. A-III, B-IV, C-II, D-I
3. A-IV, B-III, C-I, D-II
4. A-IV, B-III, C-II, D-I
| List-I (Mixture) |
List-II (Method of Separation) |
||
| A. | \( \mathrm{CHCl}_3+ \mathrm{C}_6 \mathrm{H}_5 \mathrm{NH}_2 \) | I. | Distillation under reduced pressure |
| B. | Crude oil in petroleum industry | II. | Steam distillation |
| C. | Glycerol from spent-lye | III. | Fractional distillation |
| D. | Aniline-water | Iv. | Simple distillation |
1. A-III, B-IV, C-I, D-II
2. A-III, B-IV, C-II, D-I
3. A-IV, B-III, C-I, D-II
4. A-IV, B-III, C-II, D-I
Subtopic: Purification of Organic Compounds |
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On heating, some solid substances change from solid to vapour state without passing through liquid state. The technique used for the purification of such solid substances based on the above principle is known as:
| 1. | Sublimation | 2. | Distillation |
| 3. | Chromatography | 4. | Crystallization |
Subtopic: Qualitative Analysis of Organic Compounds |
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