The species that contains only three pairs of electrons among the following is-

1. Carbocation 2. Carbanion
3. Free radical 4. None of the above

Subtopic:  Reaction Intermediates ; Preparation & Properties |
 64%
From NCERT
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H2C = O behaves as:

1. Nucleophile

2. Electrophile

3. Both (1) and (2)

4. None of the above 

Subtopic:  Nucleophile & Electrophile |
From NCERT
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Electrophiles are:

1. electron loving species            

2. electron hating species

3. nucleus loving reagents            

4. nucleus hating reagents

Subtopic:  Nucleophile & Electrophile |
 93%
From NCERT
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Nucleophiles are:

1. electron loving

2. electron hating

3. nucleus loving

4. nucleus hating

Subtopic:  Nucleophile & Electrophile |
 78%
From NCERT
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The sigma bond energy of C-H bond in C2H6 is:

(1) 99 kcal

(2) 140 kcal

(3) 200 kcal

(4) 60 kcal

Subtopic:  Hybridisation & Structure of Carbon Compounds |
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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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