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Q. No.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 |
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Subtopic: Electron Displacement Effects | Reaction Intermediates ; Preparation & Properties |
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Subtopic: Acidic & Basic Character |
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Consider the following species:
What is the hybridization of the carbon carrying a negative charge in structures (I) and (II), respectively?
What is the hybridization of the carbon carrying a negative charge in structures (I) and (II), respectively?
| 1. | sp2 and sp2 | 2. | sp2 and sp3 |
| 3. | sp and sp2 | 4. | sp3 and sp3 |
Subtopic: Hybridisation & Structure of Carbon Compounds |
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Consider the following statements
The correct statements are:
| a. | In crystallization, an impure compound is dissolved in a solvent in which it is highly soluble at room temperature. |
| b. | In the positive resonance effect(+R), the transfer of electrons is always from an atom or substituted group attached to the conjugated system. |
| c. | One of the technological applications of fractional distillation is to separate different fractions of crude oil in the petroleum industry. |
| 1. | (a) and (b) only | 2. | (b) and (c) only |
| 3. | (a) and (c) only | 4. | (a), (b), and (c) |
Subtopic: Electron Displacement Effects |
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Arrange the (C-H) bonds x, y, and z in decreasing order of their bond dissociation energies in homolysis cleavage:
1. y > x > z
2. z > x > y
3. z > y > z
4. y > z > x
1. y > x > z
2. z > x > y
3. z > y > z
4. y > z > x
Subtopic: Reaction Intermediates ; Preparation & Properties |
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A mixture of A, B, and C is added to a column containing adsorbent for separation. Using solvent, A is eluted first and B is eluted last. The B has:
1. High \(R_f \), less adsorption
2. Low \(R_f \) , strongly adsorbed
3. High \(R_f \), strong adsorption
4. Low \(R_f \) , weakly adsorbed
1. High \(R_f \), less adsorption
2. Low \(R_f \) , strongly adsorbed
3. High \(R_f \), strong adsorption
4. Low \(R_f \) , weakly adsorbed
Subtopic: Purification of Organic Compounds |
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| 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 |
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NEET 2026 - Target Batch - Vital
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The hyperconjugation effect is not observed in:
1. (i) and (ii)
2. (i), (ii) and (iii)
3. (i) only
4. (i), (ii) and (iv)
| (i) |  |
(ii) |  |
| (iii) |  |
(iv) |  |
1. (i) and (ii)
2. (i), (ii) and (iii)
3. (i) only
4. (i), (ii) and (iv)
Subtopic: Electron Displacement Effects |
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What is correct about the following structure?
1. Total stereoisomers =4
2. Number of chiral carbons =1
3. Number of optical isomers =2
4. Number of meso compounds= 2
1. Total stereoisomers =4
2. Number of chiral carbons =1
3. Number of optical isomers =2
4. Number of meso compounds= 2
Subtopic: Stereo Isomers |
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