-
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)
B)
C)
D)
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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
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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
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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)
B)
C)
D)
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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
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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
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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
View Solution play_arrow
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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
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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
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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
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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
View Solution play_arrow
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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
View Solution play_arrow
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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
View Solution play_arrow
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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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