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Q. No.Consider the following statements
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.
The correct statements are:
1.
(a) and (b) only
2.
(b) and (c) only
3.
(a) and (c) only
4.
(a), (b), and (c)
Subtopic: Electron Displacement Effects |
51%
Level 3: 35%-60%
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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 |
Level 3: 35%-60%
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Arrange the C–H bonds marked as x, y, and z in the given compound in decreasing order of their bond dissociation energy (BDE) for homolytic cleavage:
| 1. | y > x > z | 2. | z > x > y |
| 3. | z > y > z | 4. | y > z > x |
Subtopic: Reaction Intermediates ; Preparation & Properties |
51%
Level 3: 35%-60%
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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 |
Level 3: 35%-60%
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Subtopic: Acidic & Basic Character |
Level 3: 35%-60%
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Subtopic: Electron Displacement Effects | Reaction Intermediates ; Preparation & Properties |
55%
Level 3: 35%-60%
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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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In which of the following, hyperconjugation effect is not observed?
1. (i) and (ii)
2. (i), (ii) and (iii)
3. (i) only
4. (i), (ii) and (iv)
1. (i) and (ii)
2. (i), (ii) and (iii)
3. (i) only
4. (i), (ii) and (iv)
Subtopic: Electron Displacement Effects |
Level 3: 35%-60%
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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 |
Level 3: 35%-60%
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The following compound is named as :
1. 6-Mercaptocyclohex-4-ene-1,3-diol
2. 1-Mercaptocyclohex-2-ene-4,6-diol
3. 1-Mercaptocyclohex-5-ene-2,4-diol
4. 4-Mercaptocyclohex-2-ene-1,5-diol
1. 6-Mercaptocyclohex-4-ene-1,3-diol
2. 1-Mercaptocyclohex-2-ene-4,6-diol
3. 1-Mercaptocyclohex-5-ene-2,4-diol
4. 4-Mercaptocyclohex-2-ene-1,5-diol
Subtopic: Nomenclature |
Level 3: 35%-60%
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