Which of the following is strongest nucleophile?

1. Br-

2. O..H

3. C..N

4. C2H5O..

Subtopic:  Nucleophile & Electrophile |
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In hyperconjugation, the atom involved is:

1. βΗ atom

2. α-H atom

3. γ-H atom

4. All of these

Subtopic:  Electron Displacement Effects |
 87%
From NCERT
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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 |
 79%
From NCERT
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Who pointed out the concept of hyperconjugation?

(1) Nathan and Baker

(2) Mulliken

(3) Kekule

(4) Kolbe

 

Subtopic:  Electron Displacement Effects |
 76%
From NCERT
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(CH3)4N+ is neither an electrophile, nor a nucleophile because it:

1. does not have electron pair for donation as well as cannot attract electron pair

2. neither has electron pair available for donation nor can accommodate electron since all shells of N are fully occupied.

3. can act as Lewis acid and base

4. none of the above

Subtopic:  Nucleophile & Electrophile |
 76%
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The most unlikely representation of resonance structures of p-nitrophenoxide ion is:

1. 

2. 

3. 

4. 

Subtopic:  Electron Displacement Effects |
 57%
From NCERT
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Which of the following is an electrophilic reagent?

1. RO-

2. BF3

3. NH3

4. ROH

Subtopic:  Nucleophile & Electrophile |
 77%
From NCERT
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The +I (inductive effect) is shown by:

1. -CH3

2. -OH

3. -F

4. -C6H5

Subtopic:  Electron Displacement Effects |
 86%
From NCERT
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The-I effect is shown by:

1. -COOH

2. -CH3

3. -CH3CH2

4. -CHR2

Subtopic:  Electron Displacement Effects |
 89%
From NCERT
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Which of the following is singlet carbene?

1. (CH3)3C+

2. C2H5-CH

3. CH3CH2CH2-

4. CH=CH-CH2+

Subtopic:  Reaction Intermediates ; Preparation & Properties |
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