(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%
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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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In the following carbocations, the most stabile carbocation:

(1)  RCH2C+H3         (2) 

 

(3)                  (4) 

Subtopic:  Reaction Intermediates ; Preparation & Properties |
 87%
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The number of optical isomers of pent-3-en-2-ol is:

1. 2             
2. 4
3. 8             
4. 16

Subtopic:  Structural Isomers |
 62%
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