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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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 |
 82%
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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 |
 84%
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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 |
 69%
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Hints

The compound which reacts with HBr obeying Markownikoff's rule is:

1. CH2=CH2   

2. 

3. 

4. 

Subtopic:  Addition Reaction of C=C |
 61%
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Hints

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 |
 80%
From NCERT
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Consider the following bromides:

the correct order of SN1 reactivity is:

1. A>B>C

2. B>C>A

3. B>A>C

4. C>B>A

Subtopic:  SN1 & SN2 Reactions |
 74%
From NCERT
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In an SN1 reaction on chiral centres there is

1. 100% racemisation

2. inversion more than retention leading to partial racemisation

3. 100% retention

4. 100% inversion

Subtopic:  SN1 & SN2 Reactions |
 60%
NEET - 2015
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Hints

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 |
 71%
From NCERT
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