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

1.
2.
3.
4.

Subtopic:  Reaction Intermediates |
 73%
From NCERT
NEET - 2015
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Some meta-directing substituents in aromatic substitution are given.
Most deactivating group among the following is: 

1. –SO3H

2. –COOH

3. –NO2

4. –C≡N

Subtopic:  Directive Effect of functional grp |
 68%
From NCERT
AIPMT - 2013
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Among the following compounds the one that is most reactive towards electrophilic nitration is:
1. Benzoic acid
2. Nitrobenzene
3. Toluene
4. Benzene

Subtopic:  Reagents |
 69%
From NCERT
AIPMT - 2012
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Among cyclohexanol (I), acetic acid (II), 2, 4, 6-trinitrophenol (III) and phenol (IV) the correct order of decreasing acidic character will be:

1. III>II>IV>I 2. II>III>I>IV
3. II>III>IV>I 4. III>IV>II>I
Subtopic:  Directive Effect of functional grp |
 52%
From NCERT
AIPMT - 2010
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Which one is most reactive towards SN1 reaction?

1. C6H5CH(C6H5)Br

2. C6H5CH(CH3)Br

3. C6H5C(CH3)(C6H5)Br

4. C6H5CH2Br

Subtopic:  SN1 & SN2 Reactions |
 70%
From NCERT
AIPMT - 2010
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Which of the following reactions is an example of a nucleophilic substitution reaction?
1. RX + KOH → ROH + KX
2. 2RX + 2Na →R — R + 2NaX
3. RX + H2→RH + HX
4. RX + Mg →RMg X
Subtopic:  SN1 & SN2 Reactions |
 78%
From NCERT
AIPMT - 2009
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Trichloroacetaldehyde, CCl3CHO reacts with chlorobenzene in the presence of sulphuric acid and produces:
 
1. 2.
3. 4.

 

Subtopic:  Addition Reaction of C=N, C=0 |
AIPMT - 2009
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Following is the list of some aromatic compounds. Select the correct sequence of decreasing order of reactivity for electrophilic aromatic substitution reaction using the answer codes given below:

a. C6H5 - OH

b. C6H5 - CH3

c. C6H5 - NO2

d. C6H5 - CHO

Answer codes :

1. a d b c

2. c d b a 

3. a b d c

4. a b c d

Subtopic:  Directive Effect of functional grp |
 66%
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Arrange the decreasing order of reactivity of these compounds for nucleophilic substitution reaction.

a. CH3-CH2-O-S||O||O-CF3

b. CH3-CH2-O-TsCl

c. CH3-CH2-Cl

d. CH3-CH2-Br

Select the correct answer from the codes given below:

Codes:

1. c, d, a, b

2. c, d, b, a

3. a, b, c, d

4. a, b, d, c

Subtopic:  Reactions in Ether & Alcohol |
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Arrange decreasing order of reactivity of given compounds with NBS/ CCl4/ hv:

a. C6H5-CH3

b. C6H5-CH2-CH2-CH3

c. C6H5-CH2-CH=CH2

d. C6H5-C|CH3H-CH=CH2

Select the correct answer from the codes given below:

Codes :

1. d c a b

2. d c b a 

3. a b c d

4. a c b d

Subtopic:  Addition Reaction of C=C |
 66%
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