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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)

 71%
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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

 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

 

 84%
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Which of the following is the most correct electron displacement for a nucleophilic reaction to take place? 

1.
2.
3.
4.
 72%
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Consider the following statements:

a. Benzene gives substitution reaction more readily than addition reaction.

b. In benzyne mechanism reaction intermediate is carbanion also.

c. Tertiary alcohol always gives SN1 reaction.

d. Reactivity of alcohol is very poor for SN reaction because alcohol is strongly acidic in character.

Of these statements :

1. only a is correct.

2. a and c are correct

3. a, b, and d are correct

4. a, b and c are correct

 52%
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