- 1(current)
Q. No.The correct order of decreasing stability of the following carbocations is:
| I | \( \begin{aligned} &~~~~~~~~~~~~\oplus\\ & CH_3 - CH-CH_3 \end{aligned}\) |
| II | \( \begin{aligned} &~~~~~~~~~~~~\oplus\\ & CH_3 - CH-OCH_3\end{aligned}\) |
| III | \( \begin{aligned} & ~~~~~~~~~~~~\oplus\\ &CH_3 - CH-CH_2- OCH_3\end{aligned}\) |
| 1. | II > I > III | 2. | I > II > III |
| 3. | II < I < III | 4. | I < II < III |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich of the following carbon marked with asterisk is expected to have greatest positive charge?
| 1. | 2. | ||
| 3. | 4. |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyWhich carboxylate ion among the following is the most stable?
| 1. |  |
2. |  |
| 3. |  |
4. |  |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyMatch the ions given in Column I with their nature-given in Column II.
|
Column I |
Column II |
|
A. |
1. Stable due to resonance |
|
B. |
2. Destabilised due to inductive effect |
|
C. |
3. Stabilised by hyperconjugation. |
|
D. |
4. A secondary carbocation |
Codes:
| Options: | A | B | C | D |
| 1. | 1,2 | 2 | 2 | 3,4 |
| 2. | 1 | 2,4 | 3 | 4 |
| 3. | 1 | 4 | 3 | 2 |
| 4. | 4 | 1 | 3 | 2 |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyArrange the following carbanions in order of their decreasing stability:
A. \(\mathrm{H}_3 \mathrm{C}-\mathrm{C} \equiv \mathrm{C}^{-}\)
B. \(\mathrm{H}-\mathrm{C} \equiv \mathrm{C}^{-}\)
C. \(\mathrm{H}_3 \mathrm{C}-\mathrm{{C}H_2^-}\)
| 1. | A > B > C | 2. | B > A > C |
| 3. | C > B > A | 4. | C > A > B |
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & BiologyHyperconjugation involves delocalization of -
| a. | Electrons of carbon-hydrogen bond of an alkyl group directly attached to an atom of unsaturated system. |
| b. | Electrons of carbon-hydrogen bond of alkyl group directly attached to the positively charged carbon atom. |
| c. | -electrons of carbon-carbon bond |
| d. | Lone pair of electrons. |
Choose the correct option :
1. (a, b)
2. (b, c)
3. (c, d)
4. (a, c)
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NEET MCQ Books for XIth & XIIth Physics, Chemistry & Biology- 1(current)
Q. No.
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