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
Subtopic:  Electron Displacement Effects |
 57%
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Which of the following carbon marked with asterisk is expected to have greatest positive charge?

1. *CH3-CH2-Cl

2. *CH3-CH2-Mg+Cl-

3. *CH3-CH2-Br

4. *CH3-CH2-CH3

Subtopic:  Electron Displacement Effects |
 57%
From NCERT
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The most stable carboxylate ion among the following is-

1. CH3-C||O-O-

2. Cl-CH2-C||O-O-

3. F-CH2-C||O-O-

4. (F)2-CH-C||O-O-

Subtopic:  Electron Displacement Effects |
 79%
From NCERT
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Match the ions given in Column I with their nature-given in Column II.

Column I

Column II

A. 

1. Stable due to resonance

B. F3-C+

2. Destabilised due to inductive effect

C. 

3. Stabilised by hyperconjugation.

D. CH3-CH-CH3

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

Subtopic:  Electron Displacement Effects | Reaction Intermediates ; Preparation & Properties |
 75%
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Hyperconjugation involves delocalization of -

a. Electrons of carbon-hydrogen σ bond of an alkyl group directly attached to an atom of unsaturated system.
b. Electrons of carbon-hydrogen σ bond of alkyl group directly attached to the positively charged carbon atom.
c. π-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)

Subtopic:  Electron Displacement Effects |
 68%
From NCERT
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