The correct order of decreasing stability of the following cations is -

CH3-CH-CH3      ICH3-CH-OCH3IICH3-CH-CH2-OCH3III

1. II>I>III

2. I>II>III

3. II<I<III

4. I<II<III

Subtopic:  Electron Displacement Effects |
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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 |
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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 |
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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

           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 |
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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 |
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