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Q. No.
Subtopic: Acidic & Basic Character |
Level 3: 35%-60%
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What is the correct order of stability for the following carbanions?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
1. (1) > (2) > (3) > (4)
2. (2) > (3) > (4) > (1)
3. (4) > (2) > (3) > (1)
4. (1) > (3) > (2) > (4)
Subtopic: Reaction Intermediates ; Preparation & Properties |
Level 3: 35%-60%
AIPMT - 2008
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0.1688 g organic compound when analyzed by the Dumas method yields 31.7 mL of moist nitrogen measured at 14º C and 758 mm mercury pressure. The % of the nitrogen in the organic compound (Aqueous tension at 14 º C =12 mm) is:
1. 30.9%
2. 10%
3. 40%
4. 21.9 %
Subtopic: Quantitative Analysis of Organic Compounds |
59%
Level 3: 35%-60%
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Given below are two statements:
| Assertion (A): | Sulphur present in an organic compound can be estimated quantitatively by the Carius method. |
| Reason (R): | Sulphur is separated easily from other atoms in the molecule and gets precipitated as a light yellow solid. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | (A) is False but (R) is True. |
Subtopic: Quantitative Analysis of Organic Compounds |
Level 3: 35%-60%
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Consider the resonance structure of CH3COOCH3 as follows:
The correct statement among the following is:
| 1. | I and II cannot be the major contributors to the real structure of CH3COOCH3 |
| 2. | I and II can be the major contributors to the real structure of CH3COOCH3 |
| 3. | I is more stable than II. |
| 4. | None of the above |
Subtopic: Electron Displacement Effects |
Level 4: Below 35%
Hints
The correct order of decreasing stability of the following is:
\(\left(\mathrm{CH}_3\right)_3 \mathrm{C}^{-}, ^{-}\mathrm{CCl}_3,\left(\mathrm{CH}_3\right)_2 \mathrm{CH}^{-}, \mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}_2^{-}\)
| 1. | \({ }^{-} \mathrm{CCl}_3>\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}_2^{-}>\left(\mathrm{CH}_3\right)_2 \mathrm{CH}^{-}>\left(\mathrm{CH}_3\right)_3 \mathrm{C}^{-} \) |
| 2. | \(\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}_2^{-}>{ }^{-} \mathrm{CCl}_3>\left(\mathrm{CH}_3\right)_2 \mathrm{CH}^{-}>\left(\mathrm{CH}_3\right)_3 \mathrm{C}^{-} \) |
| 3. | \(\mathrm{C}_6 \mathrm{H}_5-\mathrm{CH}_2^{-}>~^{-} \mathrm{CCl}_3>\left(\mathrm{CH}_3\right)_3 \mathrm{C}^{-}>\left(\mathrm{CH}_3\right)_2 \mathrm{CH}^{-} \) |
| 4. | None of the above |
Subtopic: Electron Displacement Effects |
Level 3: 35%-60%
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Hints
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Given below are two statements:
| Assertion (A): | To detect presence of halogens in an organic compound, some dilute nitric acid is added. |
| Reason (R): | Dilute HNO3 destroys Na2S and NaCN by oxidation. |
| 1. | Both (A) and (R) are True and (R) is the correct explanation of (A). |
| 2. | Both (A) and (R) are True but (R) is not the correct explanation of (A). |
| 3. | (A) is True but (R) is False. |
| 4. | Both (A) and (R) are False. |
Subtopic: Qualitative Analysis of Organic Compounds |
Level 4: Below 35%
Hints
Among the following, the conformation that corresponds to the most stable conformation of meso-butane-2,3-diol is:
| 1. |  |
2. |  |
| 3. |  |
4. |  |
Subtopic: Stereo Isomers |
Level 4: Below 35%
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Subtopic: Electron Displacement Effects | Reaction Intermediates ; Preparation & Properties |
55%
Level 3: 35%-60%
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Subtopic: Acidic & Basic Character |
Level 3: 35%-60%
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