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question_answer1)
To which of the following four types does this reaction belong \[{{B}^{-}}+R-A\to B-R+{{A}^{-}}\] [Manipal MEE 1995]
A)
Unimolecular electrophilic substitution done
clear
B)
Bimolecular electrophilic substitution done
clear
C)
Unimolecular nucleophilic substitution done
clear
D)
Bimolecular nucleophilic substitution done
clear
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question_answer2)
An alkyl halide may be converted into an alcohol by [Pb. PMT 2000]
A)
Elimination done
clear
B)
Addition done
clear
C)
Substitution done
clear
D)
Dehydrohalogenation done
clear
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question_answer3)
The above reaction proceeds through [AMU 2000]
A)
Nucleophilic substitution done
clear
B)
Electrophilic substitution done
clear
C)
Free radical substitution done
clear
D)
More than one of the above processes done
clear
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question_answer4)
Geometry of reaction intermediate in \[S{{N}^{1}}\] reaction is [MH CET 2001]
A)
Tetrahedral done
clear
B)
Planar done
clear
C)
Triangular bipyramidal done
clear
D)
None of these done
clear
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question_answer5)
\[{{H}_{3}}C-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,}{\overset{|\,\,\,\,\,\,\,\,\,}{\mathop{C\,\,-\,}}}\,}}}\,Br+KOH(Aq.)\to {{H}_{3}}C-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,}{\overset{|\,\,\,\,\,\,\,\,\,}{\mathop{C\,\,-\,}}}\,}}}\,OH+KBr\] above reaction is [RPMT 2003]
A)
\[S{{N}^{1}}\] done
clear
B)
\[S{{N}^{2}}\] done
clear
C)
\[{{E}_{1}}\] done
clear
D)
Both A and B done
clear
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question_answer6)
In electrophilic substitution reaction nitrobenzene is [Kerala (Med.) 2003]
A)
Meta-directing done
clear
B)
Ortho-directing done
clear
C)
Para-directing done
clear
D)
Not reactive and does not undergo any substitution done
clear
E)
Non-selective done
clear
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question_answer7)
The most common type of reaction in aromatic compounds is [Orissa JEE 2003]
A)
Elimination reaction done
clear
B)
Addition reaction done
clear
C)
Electrophilic substitution reaction done
clear
D)
Rearrangement reaction done
clear
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question_answer8)
The function of \[AlC{{l}_{3}}\] in Friedel-Craft?s reaction is [KCET 2003]
A)
To absorb HCl done
clear
B)
To absorb water done
clear
C)
To produce nucleophile done
clear
D)
To produce electrophile done
clear
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question_answer9)
Which of the following can?t be used in Friedal Craft?s reactions [AFMC 2004]
A)
\[FeC{{l}_{3}}\] done
clear
B)
\[FeB{{r}_{2}}\] done
clear
C)
\[AlC{{l}_{3}}\] done
clear
D)
NaCl done
clear
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question_answer10)
The nitration of a compound is due to the [Pb. PMT 2004]
A)
\[N{{O}_{2}}\] done
clear
B)
\[N{{O}_{3}}\] done
clear
C)
NO done
clear
D)
\[NO_{2}^{+}\] done
clear
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question_answer11)
Dehydrohalogenation of an alkyl halide is a/an [MH CET 2004]
A)
Nucleophilic substitution reaction done
clear
B)
Elimination reaction done
clear
C)
Both nucleophilic substitution and elimination reaction done
clear
D)
Rearrangement done
clear
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question_answer12)
Addition of HCl to vinyl chloride gives 1, 1-dichloroethane because of [MP PET 2004]
A)
Mesomeric effect of Cl done
clear
B)
Inductive effect of Cl done
clear
C)
Restricted rotation around double bond done
clear
D)
None of these done
clear
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question_answer13)
Formation of ethylene from acetylene is an example of
A)
Elimination reaction done
clear
B)
Substitution reaction done
clear
C)
Addition reaction done
clear
D)
Condensation reaction done
clear
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question_answer14)
Conversion of \[C{{H}_{4}}\] to \[C{{H}_{3}}Cl\] is an example of which of the following reaction [Pb. CET 2001]
A)
Electrophilic substitution done
clear
B)
Free radical addition done
clear
C)
Nucleophilic substitution done
clear
D)
Free radical substituion done
clear
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question_answer15)
Following reaction, \[{{(C{{H}_{3}})}_{3}}CBr+{{H}_{2}}O\to {{(C{{H}_{3}})}_{3}}COH+HBr\] is an example of [DCE 2002]
A)
Elimination reaction done
clear
B)
Free radical substitution done
clear
C)
Nucleophilic substitution done
clear
D)
Electrophilic substitution done
clear
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question_answer16)
Which is an electrophile [DCE 2002]
A)
\[BC{{l}_{3}}\] done
clear
B)
\[C{{H}_{3}}OH\] done
clear
C)
\[N{{H}_{3}}\] done
clear
D)
\[AlCl_{4}^{-}\] done
clear
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question_answer17)
The electrophile in the nitration of benzene is [Orissa JEE 2004]
A)
\[NO_{2}^{+}\] done
clear
B)
\[N{{O}_{2}}\] done
clear
C)
\[N{{O}^{+}}\] done
clear
D)
\[NO_{2}^{-}\] done
clear
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question_answer18)
The following compound will undergo electrophilic substitution more readily than benzene [UPSEAT 2004]
A)
Nitrobenzene done
clear
B)
Benzoic acid done
clear
C)
Benzaldehyde done
clear
D)
Phenol done
clear
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question_answer19)
Which represents nucleophilic aromatic substitution reaction [Orissa JEE 2004]
A)
Reaction of benzene with \[C{{l}_{2}}\] in sunlight done
clear
B)
Benzyl bromide hydrolysis done
clear
C)
Reaction of NaOH with dinitrofluorobenzene done
clear
D)
Sulphonation of benzene done
clear
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question_answer20)
Which is an electrophile [DCE 2000]
A)
\[AlC{{l}_{3}}\] done
clear
B)
\[C{{N}^{-}}\] done
clear
C)
\[N{{H}_{3}}\] done
clear
D)
\[C{{H}_{3}}OH\] done
clear
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question_answer21)
Strongest nucleophile is [BHU 2003]
A)
\[RN{{H}_{2}}\] done
clear
B)
\[ROH\] done
clear
C)
\[{{C}_{6}}{{H}_{5}}{{O}^{-}}\] done
clear
D)
\[C{{H}_{3}}{{O}^{-}}\] done
clear
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question_answer22)
The major product obtained when \[B{{r}_{2}}/Fe\] is treated with
is [IIT-JEE Screening 2004]
A)
B)
C)
D)
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question_answer23)
Which one of the following is least reactive in a nucleophilic substitution reaction [CBSE PMT 2004]
A)
\[C{{H}_{3}}C{{H}_{2}}Cl\] done
clear
B)
\[C{{H}_{2}}=CHC{{H}_{2}}Cl\] done
clear
C)
\[{{(C{{H}_{3}})}_{3}}C-Cl\] done
clear
D)
\[C{{H}_{2}}=CHCl\] done
clear
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question_answer24)
Among the following the strongest nucleophile is [AIIMS 2005]
A)
\[{{C}_{2}}{{H}_{5}}SH\] done
clear
B)
\[C{{H}_{3}}CO{{O}^{-}}\] done
clear
C)
\[C{{H}_{3}}N{{H}_{2}}\] done
clear
D)
\[NCCH_{2}^{-}\] done
clear
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question_answer25)
The reaction [AIEEE 2005]
, is fastest when \[X\] is
A)
\[Cl\] done
clear
B)
\[N{{H}_{2}}\] done
clear
C)
\[O{{C}_{2}}{{H}_{5}}\] done
clear
D)
\[OCOR\] done
clear
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question_answer26)
Elimination of bromine from 2-bromobutane results in the formation of [AIEEE 2004, 05]
A)
Equimolar mixture of 1 and 2-butene done
clear
B)
Predominantly 2-butene done
clear
C)
Predominantly 1-butene done
clear
D)
Predominantly 2-butyne done
clear
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question_answer27)
Examine the following statements pertaining to an \[S{{N}^{2}}\] reaction (1) The rate of reaction is independent of the concentration of the nucleophile (2) The nucleophile attacks the \[{{C}^{-}}\] atom on the side of the molecule opposite to the group being displaced (3) The reaction proceeds with simultaneous bond formation and bond rupture/cleavage Amongst the following which of the above were true [NCERT 1982]
A)
1, 2 done
clear
B)
1, 3 done
clear
C)
1, 2, 3 done
clear
D)
2, 3 done
clear
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question_answer28)
What is the decreasing order of reactivity amongst the following compounds towards aromatic electrophilic substitution [IIT-JEE 1995] I. Chlorobenzene II. Benzene III. Anilinium chloride IV. Toluene
A)
\[I>II>III>IV\] done
clear
B)
\[IV>II>I>III\] done
clear
C)
\[II>I>III>IV\] done
clear
D)
\[III>I>II>IV\] done
clear
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question_answer29)
Which of the following applies in the reaction, \[C{{H}_{3}}CHBrC{{H}_{2}}C{{H}_{3}}\xrightarrow{alc.\,KOH}\] (i) \[C{{H}_{3}}CH=CHC{{H}_{3}}\] (major product) (ii) \[C{{H}_{2}}=CHC{{H}_{2}}C{{H}_{3}}\] (minor product) [Orissa JEE 2005]
A)
Markovnikov's rule done
clear
B)
Saytzeff's rule done
clear
C)
Kharasch effect done
clear
D)
Hofmann's rule done
clear
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question_answer30)
Bromination of alkanes involves [J & K 2005]
A)
Carbanions done
clear
B)
Carbocations done
clear
C)
Carbenes done
clear
D)
Free radicals done
clear
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question_answer31)
Which of the following cannot undergo nucleophilic substitution under ordinary conditions [J & K 2005]
A)
Chlorobenzene done
clear
B)
tert-butylchloride done
clear
C)
Isopropyl chloride done
clear
D)
None of these done
clear
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question_answer32)
Which of the following alkyl groups has the maximum + I effect [KCET 2002]
A)
\[C{{H}_{3}}-\] done
clear
B)
\[{{(C{{H}_{3}})}_{2}}CH-\] done
clear
C)
\[{{(C{{H}_{3}})}_{3}}C-\] done
clear
D)
\[C{{H}_{3}}C{{H}_{2}}-\] done
clear
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