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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%
From NCERT
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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 |
 55%
From NCERT
JEE
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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: Â Electron Displacement Effects |
From NCERT
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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 |
From NCERT
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Subtopic: Â Electron Displacement Effects |Â Reaction Intermediates ; Preparation & Properties |
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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 |
From NCERT
JEE
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