Conversion of cyclohexene to cyclohexanol can be conveniently achieved by:

1. NaOH + H2O

2. Br2-H2O

3. Hydroboration, oxidation

4. Hydroboration hydrolysis

Subtopic:  SN1 & SN2 Reactions |
 60%
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Bromination of (E)-2-butenedioic acid gives

(1) (2R, 3S)-2, 3-dibromosuccinic acid

(2) (2R, 3R)-2, 3-dibroniosuccinic acid

(3) a mixture of (2R, 3R) and (2S, 3S)-2, 3-dibromosuccinic acid

(4) (2S, 3S)-2, 3-dibromosuccinic acid

Subtopic:  Hofmann's Elimination & Saytzeff Elimination |
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Consider the following reaction:-

Which response contains all the correct statement about this process?
(1)Dehydration
(2)E2 mechanism
(3)Carbon skeleton migration
(4)Most stable alkene will form
(5)Single-step reaction

(a)1,3        (b)1,2,3         (c)1,2,5          (d)1,3,4

heatH3PO4 OH  +

Subtopic:  Hofmann's Elimination & Saytzeff Elimination |
 53%
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HBr(X) acetoneNaI(Y) (Major); Product (Y) is:

(1) cis-2-butene                                 

(2) trans-2-butene

(3) 1-butene                                   

(4) Iso-butene

 

Subtopic:  Reagents |
 65%
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Which position will be attacked most rapidly by the nitronium ion (-NO2)+ when the compound undergoes nitration with HNO3/H2SO4 :-

1. A

2. B

3. C

4. D

Subtopic:  Directive Effect of functional grp |
 59%
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The electrophilic aromatic substitution proceeds through a:

(1) free radical

(2) sigma complex

(3) benzyne

(4) carbene

Subtopic:  Reaction Intermediates |
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Which of the following substitution of benzene is ortho-para in electrophilic substitution and ortho-para in nucleophilic substitution ?

(1) -NO2

(2) -NO

(3) -SO3H

(4) -SO2Me

Subtopic:  Directive Effect of functional grp |
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Which one of the following undergoes nucleophilic aromatic substitution at the fastest rate?
(1) 

(2) 

(3) 

(4) 

Subtopic:  Directive Effect of functional grp |
 70%
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Many organic compounds are prepared by using PCl5 because:

(1) OH group of alcohol is easily replaced by chlorine atom

(2) chlorines are added to the unsaturated compounds

(3) it removes water from organic compounds

(4) phosphorus atoms are entered in the alcohol

Subtopic:  SN1 & SN2 Reactions |
 70%
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identify the product in the given reaction:

CH3-CH=CH2+NOClproduct

1. CH3CHCl·CH2·NO

2. CH3CH(NO)·CH2Cl

3. CH3CHCH(Cl)(NO)

4. CH2(NO)·CH2·CH2Cl

Subtopic:  Addition Reaction of C=C |
 57%
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