Which compound will give E1cb reaction?

(1) CF3-CHCl2

(2) C6H5-CH2-CH2-F

(3)           NO2
           l
CH3-CH-CHC6H5
                  l
                 OCOCH3

(4) All of these

Subtopic:  SN1 & SN2 Reactions |
 70%
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Reaction intermediate of E1 reaction is:

(1) Carbocation

(2) carbanion

(3) Carbene

(4) free radical

 

Subtopic:  Reaction Intermediates |
 75%
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Reaction intermediate of E1cb reaction is:

1. Carbocation

2. Carbanion

3. benzyne

4. free radical

Subtopic:  Addition Reaction of C=N, C=0 | SN1 & SN2 Reactions |
 58%
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In the given reaction:

CH3-CH2-CH|CH3-CH2-Bralc.KOH/X

[X] will be:

(1) CH3-CH2-C=CH2
                        I
                       CH3

(2) CH3-CH=C-CH3
                        l
                       CH3

(3) CH2=CH-CH-CH3
                       l
                      CH3

(4) CH3-CH=CH-CH2-CH3

Subtopic:  Hofmann's Elimination & Saytzeff Elimination |
From NCERT
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Which one of the following is correctly matched?

1. E2 reaction
2. E2 reaction
3. CH3CH2CH2OH E1 reaction
4. E1cb reaction

Subtopic:  SN1 & SN2 Reactions | Reactions in Ether & Alcohol |
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Which one of the following pairs is correctly matched?

(1)  E1cb reaction, Hofmann elimination

(2) Hofmann rule, most substituted alkene

(3) Saytzeff rule, least substituted alkene

(4) E1 reaction, Hofmann elimination

Subtopic:  Hofmann's Elimination & Saytzeff Elimination |
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Arrange the reactivity of alcohols in decreasing order for E1 elimination reaction:

(i)              OH
             l
CH3-CH-CH3

(ii)              OH
              l
CH3-C-CH3
            l
          CH3

(iii)                OH  
               l
C6H5-C-CH3
              l
             CH3

(iv) CH3-CH2-CH2OH

Select the correct answer from the codes given below:

Codes:

1. (iii), (ii), (iv), (i)

2. (ii), (iii), (iv), (i)

3. (ii), (iii), (i), (iv)

4. (iii), (ii), (i), (iv)

Subtopic:  Reactions in Ether & Alcohol |
 74%
From NCERT
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In the given reaction,

CH2|Br-CH=CH2NaNH2/X

[X] will be:

(1) CH3-CCH

(2) H2C=CCH2

(3) CH3-CCNa

(4) H2C=CCHNa

Subtopic:  Addition Reaction of C=C |
 52%
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Consider the following statements :

(i) Pyrolytic elimination is always  syn elimination.

(ii) In pyrolytic elimination, product formation takes place by most stable eclipsed conformation.

(iii) In pyrolytic elimination, product formation takes place by Hofmann rule.

(iv) In pyrrolytic elimination, product formation takes place by Saytzeff rule.

Of these statements :

(1) (i), (ii) and (iv) are correct

(2) (i), (ii) and (iii) are correct

(3) (i) and (ii) are correct

(4) (ii) and (iii) are correct

Subtopic:  Addition Reaction of C=C | Hofmann's Elimination & Saytzeff Elimination |
 52%
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Dichloromethane on treatment with alc. KOH/ gives:

(1) Carbene

(2) Diclorocarbene

(3) Singlet chlorocarbene

(4) Triplet chlorocarbene

Subtopic:  Reaction Intermediates |
From NCERT
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