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Q. No.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: Â Electron Displacement Effects |
 51%
Level 3: 35%-60%
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The correct arrangement of the following carbocations in decreasing order of their stability is:
1. A > B > C > D
2. B > C > A > D
3. C > B > A > D
4. C > A > B > D
Subtopic: Â Electron Displacement Effects |
 57%
Level 3: 35%-60%
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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: Â Electron Displacement Effects |
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: Â Electron Displacement Effects |
Level 4: Below 35%
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Subtopic: Â Electron Displacement Effects |Â Reaction Intermediates ; Preparation & Properties |
 55%
Level 3: 35%-60%
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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: Â Electron Displacement Effects |
Level 3: 35%-60%
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Q. No.
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