Carbanions initiate:

(1) addition reactions

(2) substitution reaction

(3) both (1) and (2)

(4) none of these

Subtopic:  SN1 & SN2 Reactions |
 63%
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Dehydrogenation of ethanol to give ethanal is:(1) additional reaction  
(2) αα elimination reaction   
(3) αβ elimination reaction   
(4) αγ elimination reaction

Subtopic:  Hofmann's Elimination & Saytzeff Elimination |
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Ease of abstraction of hydrogen is greater when attached to:

(1) 1° carbon

(2) 2° carbon

(3) 3°carbon

(4) neo carbon

Subtopic:  Addition Reaction of C=C |
 65%
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Which step is the chain termination step in the following mechanism?

(i) Cl2hνCl+Cl
(ii) Cl+ CH4CH3+ HCl
(iii)CH3+Cl2CH3Cl+Cl
(iv)Cl+CH3CH3Cl

1. (i)

2. (ii)

3. (iii)

4. (iv)

Subtopic:  Reaction Intermediates |
 70%
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Which step is chain propagation step in the following mechanism?

(i) Cl2hνCl+Cl
(ii) Cl+ CH4CH3+ HCl
(iii)Cl+ClCl2
(iv)CH3+ HClCH3Cl

1. (i)

2. (ii)

3. (iii)

4.  (iv)

Subtopic:  Addition Reaction of C=N, C=0 |
 68%
From NCERT
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Carbanion can undergo:

1. rearrangement

2. combination with cation

3. addition to a carbonyl group

4. all of the above are correct

Subtopic:  Addition Reaction of C=C |
 70%
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The SN1 mechanism for substitution reaction by nucleophile is favored by:

1. Low concentration of nucleophile

2. Weak nature of the nucleophile

3. Polar solvent

4. All of the above

Subtopic:  SN1 & SN2 Reactions |
 76%
From NCERT
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SN1 mechanism for the reaction,

R-X+KOHROH+KX follow:

(1) carbocation mechanism

(2) carbanion mechanism

(3) free radical mechanism

(4) either of these

Subtopic:  SN1 & SN2 Reactions |
 75%
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The elimination reaction among the following is:

1. CH3CH3+Cl2CH3CH2Cl+ HCl

2. CH3Cl+ KOH(aq.) CH3OH +KCl

3. CH2=CH2 +Br2 CH2BrCH2Br

4. C2H5Br+ KOH(alc.) C2H4 + KBr+H2O

Subtopic:  Reaction Intermediates |
 80%
From NCERT
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The SN2 mechanism for R-X + KOH (aq)  R-OH + KX follows with:

(1) 100% inversion

(2) 50% inversion

(3) 40% inversion

(4) 30% inversion

Subtopic:  SN1 & SN2 Reactions |
 73%
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