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%
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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%
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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%
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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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Which of the following is an example of the elimination reaction?

1. Chlorination of methane

2. Dehydration of ethanol

3. Nitration of benzene

4. Hydroxylation of ethylene

Subtopic:  Reaction Intermediates |
 83%
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The formation of cyanohydrin from a ketone is an example of:

(1) electrophilic addition

(2) nucleophilic addition

(3) nucleophilic substitution

(4) electrophilic substitution

Subtopic:  Addition Reaction of C=N, C=0 |
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The compound which reacts with HBr obeying Markownikoff's rule is:

1. CH2=CH2   

2. 

3. 

4. 

Subtopic:  Addition Reaction of C=C |
 60%
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If X is halogen the correct order for SN2 reactivity is-

1. R2CHX > R3CX > RCH2X

2. RCH2X > R3CX > R2CHX

3. RCH2X > R2CHX > R3X

4. R3CX > R2CHX > RCH2X

Subtopic:  SN1 & SN2 Reactions |
 79%
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