The electromeric effect in organic compounds is a

1. temporary effect

2. permanent effect

3. temporary-permanent effect

4. none of the above

Subtopic:  Electron Displacement Effects |
 81%
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The stability of 2,3-dimethyl but-2-ene is more than 2-butene. This can be explained in terms of:

1. Resonance

2. Hyperconjugation

3. Electromeric effect

4. Inductive effect

Subtopic:  Electron Displacement Effects |
 86%
From NCERT
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(CH3)4N+ is neither an electrophile nor a nucleophile because it:

1. does not have an electron pair for donation as well as cannot attract an electron pair.
2. neither has an electron pair available for donation nor can accommodate electrons since all shells of N are fully occupied.
3. can act as Lewis acid and base.
4. none of the above.
Subtopic:  Nucleophile & Electrophile |
 83%
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Which of the following is an electrophilic reagent?

1. RO-

2. BF3

3. NH3

4. RO····H

Subtopic:  Nucleophile & Electrophile |
 81%
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The-I effect is shown by:

1. -COOH

2. -CH3

3. -CH3CH2

4. -CHR2

Subtopic:  Electron Displacement Effects |
 90%
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Sulphur trioxide is:

1. an electrophile              2. a nucleophile

3. a homolytic agent          4. a base

Subtopic:  Nucleophile & Electrophile |
 61%
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Allyl isocyanide has:

1. 9σ and \(4\pi\) bonds.

2. 8σ and \(5\pi\) bonds.

3. 9σ, \(3\pi\) and 2 non-bonded electrons.

4. 8σ, \(3\pi\) and 4 non-bonded electrons.

Subtopic:  Hybridisation & Structure of Carbon Compounds |
 73%
From NCERT
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The least stable resonance structure among the following is:

 

Subtopic:  Reaction Intermediates ; Preparation & Properties |
 55%
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Hyperconjugation involves overlap of the following orbitals:

(1) σ - σ

(2) σ - p

(3) p - p

(4) π - π

Subtopic:  Electron Displacement Effects |
 61%
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Buta-1,3-diene and But-2-yne are:

1. position isomers

2. functional isomers

3. chain isomers

4. tautomers

Subtopic:  Structural Isomers |
 77%
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