JEE Main & Advanced Chemistry GOC Question Bank

done Organic reactions and their mechanism Total Questions - 32

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• question_answer22)
  The major product obtained when \[B{{r}_{2}}/Fe\] is treated with is [IIT-JEE Screening 2004]
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
    done clear
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow

• 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
  View Solution play_arrow