JEE Main & Advanced Chemistry GOC Question Bank

done Dipole moment, Resonance and reaction intermediates Total Questions - 49

• question_answer1)
  Which has zero dipole moment               [NCERT 1990; BHU 2001]
  A)
  cis-2-butene done clear
  B)
  trans-2-butene done clear
  C)
  1-butene done clear
  D)
  2-methyl-1-propene done clear
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• question_answer2)
  Dipole moment is shown by [DCE 1999]
  A)
  1, 4-dichloro benzene done clear
  B)
  Cis-1, 2-dichloro ethane done clear
  C)
  Trans-1, 2-dichloro, 2-pentene done clear
  D)
  Trans-1, 2-dichloro ether done clear
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• question_answer3)
  Which compound shows dipole moment [RPMT 2002]
  A)
  1,4-di-chloro benzene done clear
  B)
  1, 2-di-chloro benzene done clear
  C)
  Trans-1, 2-di-chloro ethene done clear
  D)
  Trans-2-butene done clear
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• question_answer4)
  Which of the following is a polar compound [MH CET 2003]
  A)
  \[{{C}_{2}}{{H}_{6}}\] done clear
  B)
  \[CC{{l}_{4}}\] done clear
  C)
  HCl done clear
  D)
   \[C{{H}_{4}}\] done clear
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• question_answer5)
  The dipole moment is the highest for [AIIMS 2004]
  A)
  Trans-2-butene done clear
  B)
  1, 3-Dimethylbenzene done clear
  C)
  Acetophenone done clear
  D)
   Ethanol done clear
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• question_answer6)
  Resonance structure of molecule does not have [IIT-JEE 1984]
  A)
  Identical arrangement of atoms done clear
  B)
  Nearly the same energy content done clear
  C)
  The same number of paired electrons done clear
  D)
  Identical bonding done clear
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• question_answer7)
  All bonds in benzene are equal due to [Roorkee 1990; KCET 1998]
  A)
  Tautomerism done clear
  B)
  Inductive effect done clear
  C)
  Resonance done clear
  D)
  Isomerism done clear
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• question_answer8)
  Aromatic properties of benzene are proved by [MP PMT 1994]
  A)
  Aromatic sextet theory done clear
  B)
  Resonance theory done clear
  C)
  Molecular orbital theory done clear
  D)
  All of these done clear
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• question_answer9)
  Which of the following will show aromatic behaviour [KCET 1996]
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
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• question_answer10)
  Which one of the following orders is correct regarding the inductive effect of the substituents [CBSE PMT 1998]
  A)
  \[-N{{R}_{2}}<-OR>-F\] done clear
  B)
  \[-N{{R}_{2}}>-OR>-F\] done clear
  C)
  \[-N{{R}_{2}}<-OR<-F\] done clear
  D)
  \[-N{{R}_{2}}>-OR<-F\] done clear
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• question_answer11)
  Benzene is unreactive because [KCET 1998]
  A)
  It has double bonds done clear
  B)
  It has carbon-carbon single bond done clear
  C)
  Carbon are \[s{{p}^{2}}\] hybridised done clear
  D)
  \[\pi \] electrons are delocalised done clear
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• question_answer12)
  Carboxylic acids are easily ionised. The main reason of this statement [UPSEAT 1999]
  A)
  Absence of a-hydrogen done clear
  B)
  Resonance stabilisation of carboxylate ion done clear
  C)
  Reactivity of a-hydrogen done clear
  D)
  Hydrogen bond done clear
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• question_answer13)
  \['C-C'\] bond length in benzene lies between single and double bond. The reason is [RPET 1999]
  A)
  Resonance done clear
  B)
  Isomerism done clear
  C)
  Metamerism done clear
  D)
  Inductive effect done clear
  View Solution play_arrow

• question_answer14)
  Credit for the ring structure of benzene goes to [RPET 1999]
  A)
  Wholer done clear
  B)
  Faraday done clear
  C)
  Kekule done clear
  D)
  Baeyer done clear
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• question_answer15)
  Polarisation of electrons in acroline may be written as [DCE 2000]
  A)
  \[CH_{2}^{\delta -}=CH-C{{H}^{\delta +}}=O\] done clear
  B)
  \[CH_{2}^{\delta -}=CH-CH={{O}^{\delta +}}\] done clear
  C)
  \[CH_{2}^{\delta -}=C{{H}^{\delta +}}-CH=O\] done clear
  D)
  \[CH_{2}^{\delta +}=CH-CH={{O}^{\delta -}}\] done clear
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• question_answer16)
  In the mixture of conc. \[{{H}_{2}}S{{O}_{4}}\] and \[HN{{O}_{3}}\]the nitrating species is [MP PMT 2000]
  A)
  \[{{N}_{2}}{{O}_{4}}\] done clear
  B)
  \[NO_{2}^{+}\] done clear
  C)
  \[N{{O}_{2}}\] done clear
  D)
  \[NO_{2}^{-}\] done clear
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• question_answer17)
  Which of the following are not aromatic [DCE 2001]
  A)
  Benzene done clear
  B)
  Cyclo-octatetrarenyl dianion done clear
  C)
  Tropyllium cation done clear
  D)
  Cyclopentadienyl cation done clear
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• question_answer18)
  Arrangement  of \[{{(C{{H}_{3}})}_{3}}-C-{{(C{{H}_{2}})}_{3}}-CH-C{{H}_{3}}-C{{H}_{2}}-C{{H}_{3}}\] when attached to benzyl or an unsaturated group in increasing order of inductive effect is [AIEEE 2002]
  A)
  \[{{(C{{H}_{3}})}_{3}}-C-<{{(C{{H}_{3}})}_{2}}-CH-<C{{H}_{3}}-C{{H}_{2}}-\] done clear
  B)
  \[C{{H}_{3}}-C{{H}_{2}}-<{{(C{{H}_{3}})}_{2}}-CH-<{{(C{{H}_{3}})}_{3}}-C-\] done clear
  C)
  \[{{(C{{H}_{3}})}_{2}}-CH-<{{(C{{H}_{3}})}_{3}}-C-<C{{H}_{3}}-C{{H}_{2}}-\] done clear
  D)
  \[{{(C{{H}_{2}})}_{3}}-C-<C{{H}_{3}}-C{{H}_{2}}-<{{(C{{H}_{3}})}_{2}}-CH-\] done clear
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• question_answer19)
  Which of the following is observed in ethylene molecule [MH CET 2002]
  A)
  Electromeric effect done clear
  B)
  Inductive effect done clear
  C)
  Homolytic fission done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer20)
  Cyclopentadienyl anion is [Orissa JEE 2003]
  A)
  Aromatic done clear
  B)
  Non-aromatic done clear
  C)
  Non-planar done clear
  D)
  Aliphatic done clear
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• question_answer21)
  Orbital interaction between the sigma bonds of a substitutent group and a neighbouring pi orbital is known as [Kerala PMT 2004]
  A)
  Hyperconjugation done clear
  B)
  Inductive effect done clear
  C)
  Steric effect done clear
  D)
  Dipole-dipole interactions done clear
  E)
  Electric quadruple interactions done clear
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• question_answer22)
  Which of the following is the most stable compound [BHU 2004]
  A)
  \[P{{h}_{3}}\overset{+}{\mathop{C}}\,\] done clear
  B)
    \[P{{h}_{2}}\overset{+}{\mathop{C}}\,H\] done clear
  C)
  \[P{{h}_{3}}\overset{+}{\mathop{C}}\,{{H}_{2}}\] done clear
  D)
  \[Ph\overset{+}{\mathop{C}}\,{{H}_{2}}\] done clear
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• question_answer23)
  Which of the following will be most easily attacked by an electrophile [MP PET 2004]
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
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• question_answer24)
  Reactivity towards nucleophilic addition reaction of (I) HCHO, (II) \[C{{H}_{3}}CHO\], (III) \[C{{H}_{3}}COC{{H}_{3}}\] is [Orissa JEE 2004]
  A)
  II > III > I done clear
  B)
  III > II > I done clear
  C)
  I > II > III done clear
  D)
  I > II < III done clear
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• question_answer25)
  Which of the following resonating structures of 1-methoxy-1, 3-butadiene is least stable [IIT Screening 2005]
  A)
  \[\overset{}{\mathop{C}}\,{{H}_{2}}-CH=CH-CH=\overset{\oplus }{\mathop{O}}\,-C{{H}_{3}}\] done clear
  B)
  \[C{{H}_{2}}=C{{H}_{2}}-\overset{}{\mathop{C}}\,H-CH=\overset{\oplus }{\mathop{O}}\,-C{{H}_{3}}\] done clear
  C)
  \[\overset{}{\mathop{C}}\,{{H}_{2}}-\overset{\oplus }{\mathop{C}}\,H-CH=CH-O-C{{H}_{3}}\] done clear
  D)
  \[C{{H}_{2}}=CH-\overset{}{\mathop{C}}\,H-\overset{\oplus }{\mathop{C}}\,H-O-C{{H}_{3}}\] done clear
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• question_answer26)
  Which amongst the following is the most stable carbocation [CBSE PMT 2005]
  A)
  \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|}{\overset{+}{\mathop{C}}}\,\ \ \ \ }}\,\] done clear
  B)
  \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|\ \ }{\overset{|\ \ }{\mathop{{{C}^{+}}}}}\,\ \ }}}\,\] done clear
  C)
  \[\overset{+}{\mathop{C}}\,{{H}_{3}}\] done clear
  D)
  \[C{{H}_{3}}\overset{+}{\mathop{C}}\,{{H}_{3}}\] done clear
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• question_answer27)
  Which is the decreasing order of stability [IIT-JEE (Screening) 1993] (i) \[C{{H}_{3}}-\overset{+}{\mathop{C}}\,H-C{{H}_{3}}\] (ii) \[C{{H}_{3}}-\overset{+}{\mathop{C}}\,H-O-C{{H}_{3}}\] (iii) \[C{{H}_{3}}-\overset{+}{\mathop{C}}\,H-CO-C{{H}_{3}}\]
  A)
  \[(i)<(ii)<(iii)\] done clear
  B)
  \[(i)>(ii)>(iii)\] done clear
  C)
  \[(iii)>(ii)>(i)\] done clear
  D)
   \[(ii)>(iii)>(i)\] done clear
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• question_answer28)
  The order of decreasing stability of the carbanions (1) \[{{(C{{H}_{3}})}_{3}}\bar{\ddot{C}}\]        (2) \[{{(C{{H}_{3}})}_{2}}\bar{\ddot{C}}H\] (3) \[C{{H}_{3}}\bar{\ddot{C}}{{H}_{2}}\]    (4) \[{{C}_{6}}{{H}_{5}}\bar{\ddot{C}}{{H}_{2}}\] is [KCET 1996]
  A)
  1 > 2 > 3 > 4 done clear
  B)
  4 > 3 > 2 > 1 done clear
  C)
  4 > 1 > 2 > 3 done clear
  D)
  1 > 2 > 4 > 3 done clear
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• question_answer29)
  Choose the chain terminating step (1) \[{{H}_{2}}\to {{H}^{\bullet }}+{{H}^{\bullet }}\] (2) \[B{{r}_{2}}\to B{{r}^{\bullet }}+B{{r}^{\bullet }}\] (3) \[B{{r}^{\bullet }}+HBr\to {{H}^{\bullet }}+B{{r}_{2}}\] (4) \[{{H}^{\bullet }}+B{{r}_{2}}\to HBr+B{{r}^{\bullet }}\] (5) \[B{{r}^{\bullet }}+B{{r}^{\bullet }}\to B{{r}_{2}}\] [RPET 2000]
  A)
  1 done clear
  B)
  3 done clear
  C)
  4 done clear
  D)
  5 done clear
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• question_answer30)
  The compound, which gives the most stable carbonium on dehydrogenation [UPSEAT 2001]
  A)
  \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,}{\mathop{CH}}\,}}\,-C{{H}_{2}}OH\] done clear
  B)
  \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\overset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,\,}{\overset{|\,\,\,\,\,\,\,\,\,}{\mathop{C\,\,\,-\,}}}\,}}}\,OH\] done clear
  C)
  \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}OH\] done clear
  D)
  \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,}{\mathop{CH}}\,}}\,-C{{H}_{2}}-C{{H}_{3}}\] done clear
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• question_answer31)
  Which of the following requires radical intermediate [Orissa JEE 2004]
  A)
  \[C{{H}_{3}}-CH=C{{H}_{2}}+HBr\to C{{H}_{3}}-\underset{Br\ }{\mathop{\underset{|}{\mathop{C}}\,H}}\,-C{{H}_{3}}\] done clear
  B)
  \[C{{H}_{3}}-CHO+HCN\to C{{H}_{3}}-CH<\begin{matrix}    CN  \\    OH  \\ \end{matrix}\] done clear
  C)
  \[C{{H}_{3}}-CH=C{{H}_{2}}+HBr\to C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-Br\] done clear
  D)
    \[C{{H}_{3}}CHO+N{{H}_{2}}OH\xrightarrow{{{H}^{+}}}C{{H}_{3}}-CH=N-OH\] done clear
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• question_answer32)
  Which of the following species is paramagnetic in nature [NCERT 1984]
  A)
  Free radical done clear
  B)
  Carbonium ion done clear
  C)
  Carbanion done clear
  D)
  All the above done clear
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• question_answer33)
  In which of the following species the central C-atom is negatively charged [NCERT 1985]
  A)
  Carbanion done clear
  B)
  Carbonium ion done clear
  C)
  Carbocation done clear
  D)
  Free radical done clear
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• question_answer34)
  Which of the following free radicals is most stable [NCERT 1982]
  A)
  Primary done clear
  B)
  Methyl done clear
  C)
  Secondary done clear
  D)
  Tertiary done clear
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• question_answer35)
  Which of the following contains three pairs of electrons [BHU 1985]
  A)
  Carbocation done clear
  B)
  Carbanion done clear
  C)
  Free radical done clear
  D)
  None of these done clear
  View Solution play_arrow

• question_answer36)
  Which of the following carbanion is most stable   [NCERT 1983]
  A)
  Methyl done clear
  B)
  Primary done clear
  C)
  Secondary done clear
  D)
  Tertiary done clear
  View Solution play_arrow

• question_answer37)
  Among the given cations, the most stable carbonium ion is [IIT-JEE 1981]
  A)
  sec-butyl done clear
  B)
  ter-butyl done clear
  C)
  n-butyl done clear
  D)
  None of these done clear
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• question_answer38)
  In the compound given below The correct order of the acidity of the positions (X), (Y) and (Z) is [IIT-JEE Screening 2004]
  A)
  (Z) > (X) > (Y) done clear
  B)
  (X) > (Y) > (Z) done clear
  C)
  (X) > (Z) > (Y) done clear
  D)
  (Y) > (X) > (Z) done clear
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• question_answer39)
  C-C bond length in benzene is [MP PMT 1987; MP PMT 2001; AIIMS 2001]
  A)
  \[1.39\,\overset{\circ }{\mathop{\text{A}}}\,\] done clear
  B)
  \[1.54\,\overset{\circ }{\mathop{\text{A}}}\,\] done clear
  C)
  \[1.34\,\overset{\circ }{\mathop{\text{A}}}\,\] done clear
  D)
  Different in different bonds done clear
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• question_answer40)
  Heterolysis of carbon-chlorine bond produces [MNR 1986; MP PET/PMT 1998]
  A)
  Two free radicals done clear
  B)
  Two carbonium ions done clear
  C)
  Two carbanions done clear
  D)
  One cation and one anion done clear
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• question_answer41)
  In \[C{{H}_{3}}C{{H}_{2}}OH,\] the bond that undergoes heterolytic cleavage most readily is [IIT-JEE 1988]
  A)
  C - C done clear
  B)
  C - O done clear
  C)
  C - H done clear
  D)
  O - H done clear
  View Solution play_arrow

• question_answer42)
  Which of the following intermediate have the complete octet around the carbon atom [Orissa JEE 2003]
  A)
  Carbonium ion done clear
  B)
  Carbanion ion done clear
  C)
  Free radical done clear
  D)
  Carbene done clear
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• question_answer43)
  A solution of D (+) - 2-chloro-2-phenylethane in toluene racemises slowly in the presence of small amount of \[SbC{{l}_{5}},\] due to the formation of [IIT-JEE 1999]
  A)
  Carbanion done clear
  B)
  Carbene done clear
  C)
  Free radical done clear
  D)
  Carbocation done clear
  View Solution play_arrow

• question_answer44)
  The reagent in Friedel Craft's reaction is [DPMT 2005]
  A)
  Pyridine done clear
  B)
  \[RCOCl\] done clear
  C)
  \[RCOOH\] done clear
  D)
  \[HCl\] done clear
  View Solution play_arrow

• question_answer45)
  Which gives monosubstituted product [DPMT 2005]
  A)
  \[o\]-dinitrobenzene done clear
  B)
  \[m\]-dinitrobenzene done clear
  C)
  \[p\]-dinitrobenzene done clear
  D)
  Nitrobenzene done clear
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• question_answer46)
  An aromatic compounds among other things should have a \[\pi \]-electron cloud containing electrons where \[n\] can't be [J & K 2005]
  A)
  1/2 done clear
  B)
  3 done clear
  C)
  2 done clear
  D)
  1 done clear
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• question_answer47)
  Which of the following is an electrophile [J & K 2005]
  A)
  \[{{H}_{2}}O\] done clear
  B)
  \[S{{O}_{3}}\] done clear
  C)
  \[N{{H}_{3}}\] done clear
  D)
  \[ROR\] done clear
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• question_answer48)
  The presence of the chlorine atom on benzene ring makes the second substituent enter at a position [J & K 2005]
  A)
  ortho done clear
  B)
  meta done clear
  C)
  para done clear
  D)
  ortholpara done clear
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• question_answer49)
  Which is the most stable carbocation [J & K 2005]
  A)
  iso-propyl done clear
  B)
  Triphenylmethyl cation done clear
  C)
  Ethyl cation done clear
  D)
  \[\pi \]-propyl cation done clear
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