JEE Main & Advanced Chemistry GOC Question Bank

done Critical Thinking Total Questions - 50

• question_answer1)
  In the given conformation \[{{C}_{2}}\] is rotated about \[{{C}_{2}}-{{C}_{3}}\] bond anticlockwise by an angle of \[120{}^\circ \] then the conformation obtained is [AIIMS 2004]
  A)
  Fully eclipsed conformation done clear
  B)
  Partially eclipsed conformation done clear
  C)
  Gauche conformation done clear
  D)
  Staggered conformation done clear
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• question_answer2)
  The molecular formula of diphenyl methane, , is \[{{C}_{13}}{{H}_{12}}\] How many structural isomers are possible when one of the hydrogens is replaced by a chlorine atom [CBSE PMT 2004]
  A)
  8 done clear
  B)
  7 done clear
  C)
  6 done clear
  D)
  4 done clear
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• question_answer3)
  \[S{{N}^{1}}\] reaction is faster in [Orissa JEE 2004]
  A)
  \[C{{H}_{3}}C{{H}_{2}}Cl\] done clear
  B)
  \[\begin{matrix}    C{{H}_{3}}  \\    C{{H}_{3}}  \\ \end{matrix}>CH-Cl\] done clear
  C)
  \[C{{H}_{3}}-\underset{C{{H}_{3}}\ }{\overset{C{{H}_{3}}\ }{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,-Cl}}}\,\] done clear
  D)
  \[C{{H}_{3}}-\underset{C{{H}_{3}}}{\mathop{\underset{\underset{|}{\mathop{C}}\,{{H}_{2}}}{\mathop{\underset{|}{\mathop{C}}\,H\ }}\,}}\,-Cl\] done clear
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• question_answer4)
  How many enantiomer pairs are obtained by monochlorination of 2, 3-dimethylbutane [Kerala PMT 2004]
  A)
  Nil done clear
  B)
  Four done clear
  C)
  Two done clear
  D)
  Three done clear
  E)
  One done clear
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• question_answer5)
  Among the following compounds which can be dehydrated very easily is [AIEEE 2004]
  A)
  \[C{{H}_{3}}-C{{H}_{2}}-\underset{OH\ \ \ \ \ \ }{\overset{C{{H}_{3}}\ \ \ \ }{\mathop{\underset{|}{\overset{|}{\mathop{C}}}\,-C{{H}_{2}}}}}\,-C{{H}_{3}}\] done clear
  B)
  \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-\overset{OH}{\mathop{\overset{|}{\mathop{C}}\,H}}\,-C{{H}_{3}}\] done clear
  C)
  \[C{{H}_{3}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-C{{H}_{2}}-OH\] done clear
  D)
  \[C{{H}_{3}}-C{{H}_{2}}-\underset{C{{H}_{3}}\ }{\mathop{\underset{|}{\mathop{C}}\,H-}}\,C{{H}_{2}}-C{{H}_{2}}-OH\] done clear
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• question_answer6)
  Which of the following statements is not characteristic of free radical chain reaction [JIPMER 1997]
  A)
  It gives major product derived from most stable free radical done clear
  B)
  It is usually sensitive to change in solvent polarity done clear
  C)
  It proceeds in three main steps like initiation, propagation and termination done clear
  D)
  It may be initiated by U.V. light done clear
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• question_answer7)
  Most stable carbanion is [BHU 2003]
  A)
  \[CH_{3}^{-}\] done clear
  B)
  \[C{{H}_{3}}CH_{2}^{-}\] done clear
  C)
  done clear
  D)
  done clear
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• question_answer8)
  Among the following the dissociation constant is highest for [AIIMS 2004]
  A)
  \[{{C}_{6}}{{H}_{5}}OH\] done clear
  B)
  \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}OH\] done clear
  C)
  \[C{{H}_{3}}C\equiv CH\] done clear
  D)
  \[C{{H}_{3}}NH_{3}^{+}C{{l}^{-}}\] done clear
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• question_answer9)
  Which one of the following compounds is most acidic [CBSE PMT 2005]
  A)
  \[Cl-C{{H}_{2}}-C{{H}_{2}}-OH\] done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
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• question_answer10)
  Which one is electrophilic addition [AMU (Engg.) 1999]
  A)
  \[C{{H}_{3}}-C{{H}_{3}}+C{{l}_{2}}\to {{C}_{2}}{{H}_{5}}Cl+HCl\] done clear
  B)
  \[C{{H}_{3}}CH=O+HCN\to {{(C{{H}_{3}})}_{2}}C(OH)CN\] done clear
  C)
  \[B{{r}_{2}}\to B{{r}^{\bullet }}+B{{r}^{\bullet }}\] done clear
  D)
  \[C{{H}_{2}}=C{{H}_{2}}+B{{r}_{2}}\to C{{H}_{2}}BrC{{H}_{2}}Br\] done clear
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• question_answer11)
  A compound has 3 chiral carbon atoms. The number of possible optical isomers it can have [DCE 2004]
  A)
  3 done clear
  B)
  2 done clear
  C)
  8 done clear
  D)
  4 done clear
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• question_answer12)
  How many chiral isomers can be drawn from 2-bromo, 3-chloro butane [DCE 2003]
  A)
  2 done clear
  B)
  3 done clear
  C)
  4 done clear
  D)
  5 done clear
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• question_answer13)
  Number of isomers of \[{{C}_{4}}{{H}_{10}}\] is [CBSE PMT 1996; AFMC 1997; RPMT 2002; MP PMT 1997]
  A)
  2 done clear
  B)
  3 done clear
  C)
  4 done clear
  D)
  Isomerism not exist done clear
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• question_answer14)
  The number of possible isomers for compound \[{{C}_{2}}{{H}_{3}}C{{l}_{2}}Br\] is [MP PMT 1999]
  A)
  2 done clear
  B)
  3 done clear
  C)
  4 done clear
  D)
  5 done clear
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• question_answer15)
  The optically active tartaric acid is named as  D-(+)- tartaric acid because it has a positive [IIT-JEE 1999]
  A)
  Optical rotation and is derived from D-glucose done clear
  B)
  pH in organic solvent done clear
  C)
  Optical rotation and is derived from D(+) glyceraldehyde done clear
  D)
  Optical rotation only when substituted by deuterium done clear
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• question_answer16)
  Among the following compounds (I-III) the correct order of reaction with electrophilic reagent is [CBSE PMT 1997]
  A)
  II > III > I done clear
  B)
  III < I < II done clear
  C)
  I > II > III done clear
  D)
  I = II > III done clear
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• question_answer17)
  Carbocation which is most stable [BHU 2003]
  A)
  \[C{{H}_{3}}C{{H}_{2}}^{+}\] done clear
  B)
  \[C{{H}_{3}}^{+}\] done clear
  C)
  \[{{C}_{6}}{{H}_{5}}C{{H}_{2}}^{+}\] done clear
  D)
  \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}^{+}\] done clear
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• question_answer18)
  Tautomerism is exhibited by [CBSE PMT 1997; KCET 2002]
  A)
  \[{{(C{{H}_{3}})}_{3}}CNO\] done clear
  B)
  \[{{(C{{H}_{3}})}_{2}}NH\] done clear
  C)
  \[{{R}_{3}}CN{{O}_{2}}\] done clear
  D)
  \[RC{{H}_{2}}N{{O}_{2}}\] done clear
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• question_answer19)
  Which of the following will have geometrical isomers [MP PET 1996; MP PMT 1997; AFMC 1997]
  A)
  2-methylpropene done clear
  B)
  2-butene done clear
  C)
  1-butene done clear
  D)
  Propene done clear
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• question_answer20)
  Examine the following three pairs of possible isomers Now state whether the pairs represent identical compounds or different isomers
  A)
  All three pairs represent different compounds done clear
  B)
  (ia) and (ib) are identical; (iia) and (iib) are identical; and (iiia) and (iiib) are identical done clear
  C)
  (ia) and (ib) are isomers; (iia) and (iib) are identical; and (iiia) and (iiib) are isomers done clear
  D)
  (ia) and (ib) are identical; (iia) and (iib) are identical, and (iiia) and (iiib) are isomers done clear
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• question_answer21)
  Tautomerism is exhibited by [IIT-JEE 1998]
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
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• question_answer22)
  The following reaction is described as [CBSE PMT 1997] \[\begin{matrix}    C{{H}_{3}}{{(C{{H}_{2}})}_{5}}  \\    {}  \\    {{H}_{3}}C  \\ \end{matrix}>\underset{H}{\mathop{\underset{|}{\mathop{C}}\,}}\,-Br\xrightarrow{OH}HO-\underset{H}{\mathop{\underset{|}{\mathop{C}}\,}}\,<\begin{matrix}    {{(C{{H}_{2}})}_{5}}C{{H}_{3}}  \\    {}  \\    C{{H}_{3}}\,\,\,\,\,\,\,\,\,\,\,  \\ \end{matrix}\]
  A)
  \[S{{E}^{2}}\] done clear
  B)
  \[S{{N}^{1}}\] done clear
  C)
  \[S{{N}^{2}}\] done clear
  D)
  \[S{{N}^{0}}\] done clear
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• question_answer23)
  Which one of the following represents eclipsed form of ethane
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  None of these done clear
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• question_answer24)
  Which are the staggered forms of ethane
  A)
  1 and 4 done clear
  B)
  3 and 4 done clear
  C)
  2 and 4 done clear
  D)
  1 and 3 done clear
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• question_answer25)
  Which of the following is the most stable cation [CBSE PMT 1988; MNR 1988; AIIMS 1985]
  A)
  \[C{{H}_{3}}C{{H}_{2}}\overset{+}{\mathop{C}}\,HC{{H}_{3}}\] done clear
  B)
  \[C{{H}_{3}}-\underset{C{{H}_{3}}\,\,\,\,}{\mathop{\underset{|\,\,\,\,\,\,\,\,\,\,\,}{\mathop{\overset{+}{\mathop{C}}\,C{{H}_{3}}}}\,}}\,\] done clear
  C)
  \[C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}\overset{+}{\mathop{C}}\,{{H}_{2}}\] done clear
  D)
  \[CH_{3}^{+}\] done clear
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• question_answer26)
  In a reaction of \[{{C}_{6}}{{H}_{5}}Y,\] the major product (> 60%) is m-isomer, so the group Y is [AIIMS 1997; UPSEAT 2003]
  A)
  \[-COOH\] done clear
  B)
  \[-N{{H}_{2}}\] done clear
  C)
  \[-OH\] done clear
  D)
  \[-Cl\] done clear
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• question_answer27)
  Dehydrohalogenation in presence of \[O{{H}^{-}}\] is correctly represented by [Orissa JEE 2004]
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
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• question_answer28)
  Number of structural isomers of \[{{C}_{4}}{{H}_{10}}O\] are [CPMT 1983, 84, 89, 91; MADT Bihar 1984; MNR 1984; MP PET 1997; Pb. PMT 1999; MH CET 2003]
  A)
  3 done clear
  B)
  6 done clear
  C)
  7 done clear
  D)
  10 done clear
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• question_answer29)
  Among the following the aromatic compound is [AIIMS 2004]
  A)
  done clear
  B)
  done clear
  C)
  done clear
  D)
  done clear
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• question_answer30)
  Which of the following compounds are not arranged in order of decreasing reactivity towards electrophilic substitution [DCE 2003]
  A)
  Fluoro benzene > chloro benzene > bromo benzene done clear
  B)
  Phenol > n-propyl benzene > benzoic acid done clear
  C)
  Chloro toluene > para-nitro toluene > 2-chloro-4-nitro toluene done clear
  D)
  Benzoic acid > phenol > n-propyl benzene done clear
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• question_answer31)
  Most stable carbonium ion is [Pb. CET 2004]
  A)
  \[{{\overset{+}{\mathop{C}}\,}_{2}}{{H}_{5}}\] done clear
  B)
  \[{{(C{{H}_{3}})}_{3}}\overset{+}{\mathop{C}}\,\] done clear
  C)
  \[{{({{C}_{6}}{{H}_{5}})}_{3}}\overset{+}{\mathop{C}}\,\] done clear
  D)
  \[{{C}_{6}}{{H}_{5}}\overset{+}{\mathop{C}}\,{{H}_{2}}\] done clear
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• question_answer32)
  Which one of the following species is most stable [IIT-JEE 1995]
  A)
  \[p-{{O}_{2}}N-{{C}_{6}}{{H}_{4}}-\overset{+}{\mathop{C}}\,{{H}_{2}}\] done clear
  B)
  \[p-C{{H}_{3}}O-{{C}_{6}}{{H}_{4}}-\overset{+}{\mathop{C}}\,{{H}_{2}}\] done clear
  C)
  \[p-Cl-{{C}_{6}}{{H}_{4}}-\overset{+}{\mathop{C}}\,{{H}_{2}}\] done clear
  D)
  \[{{C}_{6}}{{H}_{5}}-\overset{+}{\mathop{C}}\,{{H}_{2}}\] done clear
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• question_answer33)
  Which of the following gives most stable carbocation by dehydration [RPMT 2002]
  A)
  \[(C{{H}_{3}}){{}_{2}}CH-OH\] done clear
  B)
  \[{{(C{{H}_{3}})}_{3}}C-OH\] done clear
  C)
  \[C{{H}_{3}}-C{{H}_{2}}-OH\] done clear
  D)
  \[C{{H}_{3}}-C{{H}_{2}}-O-C{{H}_{2}}-C{{H}_{3}}\] done clear
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• question_answer34)
  Which of the following orders regarding relative stability of free radicals is correct [UPSEAT 2004]
  A)
  \[3{}^\circ <2{}^\circ <1{}^\circ \] done clear
  B)
  \[3{}^\circ \text{ }>\text{ }2{}^\circ \text{ }>\text{ }1{}^\circ \] done clear
  C)
  \[1{}^\circ \text{ }<\text{ }2{}^\circ \text{ }>\text{ }3{}^\circ \] done clear
  D)
  \[3{}^\circ \text{ }>\text{ }2{}^\circ \text{ }<\text{ }1{}^\circ \] done clear
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• question_answer35)
  The +I effect of alkyl groups is in the order [DCE 2002]
  A)
  \[2{}^\circ \text{ }>\text{ }3{}^\circ \text{ }>\text{ }1{}^\circ ~~~~~~~~~~\] done clear
  B)
  \[1{}^\circ \text{ }>\text{ }2{}^\circ \text{ }>\text{ }3{}^\circ \] done clear
  C)
  \[3{}^\circ \text{ }>\text{ }2{}^\circ \text{ }>\text{ }1{}^\circ ~~~~~~~~~~\] done clear
  D)
  None of these done clear
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• question_answer36)
  Which one has asymmetric C-atom [Roorkee 1995]
  A)
  \[C{{H}_{3}}-C{{H}_{2}}-\underset{Br}{\mathop{\underset{|\,\,\,\,\,}{\mathop{C{{H}_{2}}}}\,}}\,\] done clear
  B)
  \[C{{H}_{3}}-\underset{Br}{\mathop{\underset{|\,\,\,}{\mathop{CH}}\,}}\,--\underset{C{{H}_{3}}}{\mathop{\underset{|\,\,\,\,\,\,\,}{\mathop{CH-}}\,}}\,C{{H}_{3}}\] done clear
  C)
  \[C{{H}_{3}}-C{{H}_{2}}-\underset{Br}{\mathop{\underset{|\,\,\,}{\mathop{CH}}\,}}\,-C{{H}_{3}}\] done clear
  D)
  \[C{{H}_{3}}-\underset{Br\,}{\mathop{\underset{|\,\,\,\,}{\mathop{\overset{C{{H}_{3}}}{\mathop{\overset{|\,\,\,\,}{\mathop{C-}}\,}}\,}}\,}}\,C{{H}_{2}}-C{{H}_{2}}-C{{H}_{3}}\] done clear
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• question_answer37)
  Which of the following compounds will show metamerism [KCET 1996]
  A)
  \[C{{H}_{3}}COO{{C}_{2}}{{H}_{5}}\] done clear
  B)
  \[{{C}_{2}}{{H}_{5}}-S-{{C}_{2}}{{H}_{5}}\] done clear
  C)
  \[C{{H}_{3}}-O-C{{H}_{3}}\] done clear
  D)
  \[C{{H}_{3}}-O-{{C}_{2}}{{H}_{5}}\] done clear
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• question_answer38)
  How many carbon atoms in the molecule \[HCOO-{{(CHOH)}_{2}}-COOH\]are asymmetric [MP PET 2001]
  A)
  1 done clear
  B)
  2 done clear
  C)
  3 done clear
  D)
  None of these done clear
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• question_answer39)
  Which of the following act as nucleophiles [Roorkee 1999]
  A)
  \[C{{H}_{3}}N{{H}_{2}}\] done clear
  B)
  \[R{{O}^{-}}\] done clear
  C)
  \[AlC{{l}_{3}}\] done clear
  D)
  \[C{{H}_{3}}MgBr\] done clear
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• question_answer40)
  Which of the following has the highest nucleophilicity [IIT-JEE Screening 2000]
  A)
  \[{{F}^{-}}\] done clear
  B)
  \[O{{H}^{-}}\] done clear
  C)
  \[CH_{3}^{-}\] done clear
  D)
  \[NH_{2}^{-}\] done clear
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• question_answer41)
  Keto-enol tautomerism is found in [IIT-JEE 1988; MADT Bihar 1995]
  A)
  \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-H\] done clear
  B)
  \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-{{C}_{6}}{{H}_{5}}\] done clear
  C)
  \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{3}}\] done clear
  D)
  \[{{H}_{5}}{{C}_{6}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{2}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-C{{H}_{3}}\] done clear
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• question_answer42)
  Which of the following compounds will show geometrical isomerism [IIT-JEE 1998]
  A)
  2-butene done clear
  B)
  Propene done clear
  C)
  1-phenylpropene done clear
  D)
  2-methyl-2-butene done clear
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• question_answer43)
  Which behaves both as a nucleophile and electrophile [IIT-JEE Screening 1991; Pb. CET 1985]
  A)
  \[C{{H}_{3}}N{{H}_{2}}\] done clear
  B)
  \[C{{H}_{3}}Cl\] done clear
  C)
  \[C{{H}_{3}}CN\] done clear
  D)
  \[C{{H}_{3}}OH\] done clear
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• question_answer44)
  The number of optical isomers of an organic compound having n asymmetric carbon atoms will be [MP PET 1994]
  A)
  \[{{2}^{n+1}}\] done clear
  B)
  \[{{n}^{2}}\] done clear
  C)
  \[{{2}^{n}}\] done clear
  D)
  \[{{2}^{n-1}}\] done clear
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• question_answer45)
  Total number of isomers of \[{{C}_{6}}{{H}_{14}}\] are [IIT-JEE 1987; DPMT 1983; CPMT 1991; MNR 1990; MP PET 1995; UPSEAT 2001]
  A)
  4 done clear
  B)
  5 done clear
  C)
  6 done clear
  D)
  7 done clear
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• question_answer46)
  With a change in hybridisation of the carbon bearing the charge, the stability of a carbanion increase in the order [DCE 2003]
  A)
  \[sp<s{{p}^{2}}<s{{p}^{3}}\] done clear
  B)
  \[sp<s{{p}^{3}}<s{{p}^{2}}\] done clear
  C)
  \[s{{p}^{3}}<s{{p}^{2}}<sp\] done clear
  D)
  \[s{{p}^{2}}<sp<s{{p}^{3}}\] done clear
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• question_answer47)
  The C - C bond length of the following molecules is in the order [IIT-JEE 1991]
  A)
  \[{{C}_{2}}{{H}_{6}}>{{C}_{2}}{{H}_{4}}>{{C}_{6}}{{H}_{6}}>{{C}_{2}}{{H}_{2}}\] done clear
  B)
  \[{{C}_{2}}{{H}_{2}}<{{C}_{2}}{{H}_{4}}<{{C}_{6}}{{H}_{6}}<{{C}_{2}}{{H}_{6}}\] done clear
  C)
  \[{{C}_{2}}{{H}_{6}}>{{C}_{2}}{{H}_{2}}>{{C}_{6}}{{H}_{6}}>{{C}_{2}}{{H}_{4}}\] done clear
  D)
  \[{{C}_{2}}{{H}_{4}}>{{C}_{2}}{{H}_{6}}>{{C}_{2}}{{H}_{2}}>{{C}_{6}}{{H}_{6}}\] done clear
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• question_answer48)
  In the reaction \[C{{H}_{3}}CHO+HCN\to C{{H}_{3}}CH(OH)CN\]a chiral centre is produced. This product would be [CBSE PMT 1995]
  A)
  Laevorotatory done clear
  B)
  Meso compound done clear
  C)
  Dextrorotatory done clear
  D)
  Racemic mixture done clear
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• question_answer49)
  Cyclic hydrocarbon molecule ?A? has all the carbon and hydrogen in a single plane. All the carbon-carbon bonds are of same length less than 1.54Å, but more than 1.34Å. The \[C-C\] bond angle will be  [BVP 2003]
  A)
  \[{{109}^{o}}2{8}'\] done clear
  B)
  \[{{100}^{o}}\] done clear
  C)
  \[{{180}^{o}}\] done clear
  D)
  \[{{120}^{o}}\] done clear
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• question_answer50)
  How many structural isomers are possible for a compound with molecular formula \[{{C}_{3}}{{H}_{7}}Cl\] [CBSE PMT 2001]
  A)
  2 done clear
  B)
  5 done clear
  C)
  7 done clear
  D)
  9 done clear
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