CHAPTER ORGANIC CHEMISTRY SOME BASIC …(12).pdfChapterwise Previous year Qs 100 CHAPTER ORGANIC...

Chapterwise Previous year Qs

100

CHAPTER

ORGANIC CHEMISTRY –

SOME BASIC PRINCIPLES

AND TECHNIQUES

1. How many chain isomers could be obtained from the alkane C6H14? [1988] (a) Four (b) Five (c) Six (d) Seven Ans: (b) 2. Which of the following is an optically active compound? [1988] (a) 1-Butanol (b) 1-Propanol (c) 2-Chlorobutane (d) 4-Hydroxyheptane Ans: (c) 3. The Cl – C– Cl angle in 1,1,2,2- tetrachloroethene and tetrachloromethane respectively will be about [1988] (a) 120° (b) 90° and 109.5° (c) 109.5° and 90° (d) 120° and 109.5° Ans: (d) 4. Which of the following possesses a sp-carbon in its structure? [1989] (a) CH2 = CCI– CH= CH2 (b) CCl2 = CCl2 (c) CH2 = C= CH2 (d) CH2 = CH– CH= CH2. Ans: (c) 5. Cyclic hydrocarbon ‘A’ has all the carbon and hydrogen atoms in a single plane. All the carbon carbon bonds have the same length, less than 1.54 Å, but more than 1.34 Å. The C– C– C bond angle will be [1989] (a) 109° 28' (b) 100° (c) 180° (d) 120° Ans: (d) 6. Lassaigne’s test is used in qualitative analysis to detect [1989] (a) Nitrogen (b) Sulphur

(c) Chlorine (d) All of these Ans: (b) 7. Which one of the following can exhibit cis-trans isomerism? [1989] (a) CH3 CHCl COOH (b) H-C=C-Cl (c) ClCH-CHCl (d) ClCH2-CH-Cl2 Ans: (c) 8. Kjeldahl’s method is used in the estimation of (a) Nitrogen (b) Halogens [1990] (c) Sulphur (d) Oxygen Ans: (a) 9. An organic compound X(molecular formula C6H7O2N) has six carbon atoms in a ring system, two double bonds and a nitro group as substituent, X is [1990] (a) Homocyclic but not aromatic (b) Aromatic but not homocyclic (c) Homocyclic and aromatic (d) Heterocyclic and aromatic Ans: (a)

10. In sodium fusion test of organic compounds,

the nitrogen of the organic compound is converted into [1991] (a) Sodamide (b) Sodium cyanide (c) Sodium nitrite (d) Sodium nitrate Ans: (b) 11. The shortest C– C bond distance is found in (a) Diamond (b) Ethane [1991] (c) Benzene (d) Acetylene Ans: (d) 12. An sp3 hybrid orbital contains [1991] (a) 1/4 s-character (b) 1/2 s-character

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(c) 1/3 s-character (d) 2/3 s-character. Ans: (a) 13. A straight chain hydrocarbon has the molecular formula C8H10. The hybridization of the carbon atoms from one end of the chain to the other are respectively sp3, sp2, sp2, sp3, sp2, sp2, sp and sp. The structural formula of the hydrocarbon would be: [1991] (a) CH3=CCH2 – CH= CHCH= CH2 (b) CH3CH2 – CH= CHCH= CHC=CH (c) CH3CH= CHCH2 – C=CCH= CH2 (d) CH3CH= CHCH2 – CH= CH= C=CH. Ans: (d) 14. Isomers of a substance must have the same (a) Structural formula [1991] (b) Physical properties (c) Chemical properties (d) Molecular formula Ans: (d) 15. (a) (b) (c) (d) Ans: (c) 16. A is a lighter phenol and B is an aromatic carboxylic acid. Separation of a mixture of A and B can be carried out easily by using a solution of (a) Sodium hydroxide [1992] (b) Sodium sulphate (c) calcium chloride (d) Sodium bicarbonate Ans: (d) 17. 2-Methyl 2-butene will be represented as [1992]

(a)

(b)

(c)

(d) Ans: (b)

18.

[1992] (a) 4-Hydroxy-1-methylpentanal (b) 4-Hydroxy-2-methylpent-2-en-1-al (c) 2-Hydroxy-4-methylpent-3-en-5-al (d) 2-Hydroxy-3-methylpent-2-en-5-al Ans: (b) 19. When the hybridization state of carbon atom changes from sp3 to sp2 and finally to sp, the angle between the hybridized orbitals [1993] (a) decreases gradually (b) decreases considerably (c) is not affected (d) increases progressively. Ans: (d) 20. The most reactive compound for electrophilic nitration is [1992] (a) Benzene (b) Nitrobenzene (c) Benzoic acid (d) Toluene. Ans: (d) 21. Which is the correct symbol relating the two Kekule structures of benzene? [1993]

(a)

(b) (c)

(d) Ans: (d) 22. The restricted rotation about carbon carbon double bond in 2-butene is due to [1993] (a) Overlap of one s- and sp2- hybridized orbitals (b) Overlap of two sp2 - hybridized orbitals (c) Overlap of one p- and one sp2 - hybridized orbitals (d) Sideways overlap of two p- orbitals. Ans: (d) 23. An important chemical method to resolve a racemic mixture makes use of the formation of [1994] (a) a meso compound (b) enantiomers (c) diasteromers (d) racemates


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Ans: (c) 24. The process of separation of a racemic modification into d and A-enantiomers is called (a) Resolution [1994] (b) Dehydration (c) Revolution (d) Dehydrohalogenation Ans: (a) 25. Correct increasing order of acidity is as follows:

(a)

(b)

(c)

(d) Ans: (d) 26. An example of electrophilic substitution reaction is [1994] (a) Chlorination of methane (b) Conversion of methyl chloride to methyl alcohol (c) Nitration of benzene (d) Formation of ethylene from ethyl alcohol. Ans: (c) 27.

[1994] (a) 2-Methyl-3-ethylpentane (b) 3-Ethyl-2-methylpentane (c) 2-Ethyl-3-methylpentane (d) 3-Methyl-2-ethylpentane Ans: (b) 28. Lassaigne’s test for the detection of nitrogen fails in [1994] (a) NH2CONHNH2.HCl (b) NH2NH2.HCl (c) NH2CONH2 (d) C6H5NHNH2.HCL Ans: (b) 29. The most suitable method for separtion of a 1: 1 mixture of ortho and para nitrophenols is [1994] (a) Sublimation (b) Chromatography

(c) Crystallization (d) Steam distillation Ans: (d) 30. The first organic compound, synthesized in the laboratory, was [1995] (a) alcohol (b) acetic acid (c) urea (d) none of these Ans: (c) 31. The number of possible isomers of the compound with molecular formula C7H8Ois [1995] (a) 3 (b) 5 (c) 7 (d) 9 Ans: (b) 32.

[1996] (a) 1, 3-isopropyl-3-methylpropane (b) 2, 3, 6-trimethylheptane (c) 2, 5, 6-trimethylheptane (d) 2, 6, 3-trimethylheptane Ans: (b) 33. Huckel's rule states that a monocyclic conjugated compound will be aromatic if it contains [1996] (a) (4n + 2 PIE) electrons Disha Experts. 29 Years NEET AIPMT Topic wise Solved Papers CHEMISTRY 1988 to 2016 11th Edition (Page 89) . . Kindle Edition. (b) (4S + 2n) electrons Disha Experts. 29 Years NEET AIPMT Topic wise Solved Papers CHEMISTRY 1988 to 2016 11th Edition (Page 89) . . Kindle Edition. (c) 4S electrons Disha Experts. 29 Years NEET AIPMT Topic wise Solved Papers CHEMISTRY 1988 to 2016 11th Edition (Page 89) . . Kindle Edition. (d) (4n + 2) S electrons Disha Experts. 29 Years NEET AIPMT Topic wise Solved Papers CHEMISTRY 1988 to 2016 11th Edition (Page 89) . . Kindle Edition. Ans: (d) 34. Which of the following will not show cis-trans isomerism? [1996]


103

(a)

(b)

(c)

(d) Ans: (c) 35. Which of the following will exhibit chirality? [1996] (a) 2-Methylhexane (b) 3-Methylhexane (c) Neopentane (d) Isopentane Ans: (b) 36. Decreasing order of reactivity towards nucleophilic addition to carbonyl group among cyclopentanone, 3-pentanone and n-pentanal is [1996] (a) 3-pentanone, cyclopentanone, n-pentanal (b) n-pentanal, 3-pentanone, cyclopentanone (c) n-pentanal, cyclopentanone, 3-pentanone (d) cyclopentanone, 3-pentanone, n-pentanal Ans: (c) 37. Which one of the following is a technique most suitable for purification of cyclohexanone from a mixture containing benzoic acid, isoamyl alcohol, cyclohexane and cyclohexanone? [1997] (a) Crystallization (b) Sublimation (c) IRspectroscopy (d) Gas chromatography Ans: (c) 38. Tautomerism will be exhibited by [1997] (a) (CH3) 2NH (b) (CH3) 3CNO (c) R3CNO2 (d) RCH2NO2 Ans: (d) 39.

[1997]

(a) SE2 (b) SN1 (c) SNO (d) SN2 Ans: (d)

40. Which one of these is not compatible with

arenes? [1997] (a) Greater stability (b) Delocalisation of pie-electrons (c) Electrophilic additions (d) Resonance Ans: (c) 41. The most stable conformation of n-butane is (a) skew boat (b) gauche (c) staggered-anti (d) eclipsed Ans: (c) 42.

[1997] (a) II> III> I (b) III> II> I (c) II> I> III (d) I> II> III Ans: (d) 43.

[1998] (a) trans-3-iodo-4-chloro-3-pentene (b) cis-2-chloro-3-iodo-2-pentene (c) trans-2-chloro-3-iodo-2-pentene (d) cis-3-iodo-4-chloro-3-pentene



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Ans: (c) 44. Which one of the following compounds will be most easily attacked by an electrophile? [1998]

(a)

(b)

(c)

(d) Ans: (d) 45. Which of the following compounds is not chiral? [1998] (a) DCH2CH2CH2Cl (b) CH3CH2CHDCl (c) CH3CHDCH2Cl (d) CH3CHClCH2D Ans: (a) 46. Which one of the following compounds is resistant to nucleophilic attack by hydroxyl ions? (a) Methyl acetate (b) Acetonitrile [1998] (c) Diethyl ether (d) Acetamide Ans: (c) 47. Which one of the following orders is correct regarding the I effect of the substituents? (a) —NR2 <—OR>—F (b) —NR2 > —OR>—F (c) —NR2 <—OR<—F (d) —NR2 >—OR<—F Ans: (c) 48. The correct structure of trans-2 hexenal is [1999]

(a)

(b)

(c)

(d) Ans: (a) 49. The structural formula of a compound is CH3 – CH= C= CH2. The types of hybridization at the four carbons from left to right are (a) sp2, sp2, sp2, sp3 (b) sp2, sp3, sp2, sp2 (c) sp3, sp2, sp ,sp2 (d) sp3, sp2, sp2, sp2 Ans: (c) 50. Which is a chiral molecule? [1999] (a) 2, 2-dimethylbutanoic acid (b) 4-methylpentanoic acid (c) 3-methylpentanoic acid (d) 3,3-dimethylbutanoic acid Ans: (c) 51.

[1999] (a) III> IV> II> I (b) II> I> IV> III (c) I> IV> II> III (d) III> IV> I> II Ans: (a) 52. Correct order of stability is: [2000] (a) cis -2- butene > 1-butene > trans -2-butene (b) trans-2-butene > cis-2-butene > 1-butene (c) 1-butene > cis-2-butene > trans-2- butene (d) cis-2-butene > trans-2-butene > 1-butene Ans: (b) 53. Which of the following compounds reacts slower in electrophilic substitution? [2000] (a) C6H5NO2 (b) C6H5OH (c) C6H5CH3


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(d) C6H5NH2 Ans: (a) 54. A compound of molecular formula of C7H16 shows optical isomerism, compound will be (a) 2, 3-Dimethylpentane (b) 2,2-Dimethylbutane (c) 3-Methylhexane (d) None of the above Ans: (a) 55.

[2001] (a) III> I> II (b) I> III> II (c) II> III> I (d) I> II> III Ans: (a) 56. In steam distillation of toluene, the pressure for toluene in vapour is [2001] (a) Equal to pressure of barometer (b) Less than pressure of barometer (c) Equal to vapour pressure of toluene in simple distillation (d) More than vapour pressure of toluene in simple distillation Ans: (b) 57. The incorrect IUPAC name is [2001]

(a)

(b)

(c)

(d) Ans: (a) 58. IUPACname of the following is CH2 CHCH2 CH2 C{CH [2002] (a) 1, 5-hexenyne (b) 1-hexene- 5-yne (c) 1-hexyne- 5-ene (d) 1, 5-hexynene Ans: (b) 59. 3 || 2 .. CHOCHCand 3 | 2 CH: O.. : CHCare (a) Resonating structures [2002] (b) Tautomers (c) Geometrical isomers (d) Optical isomers Ans: (a) 60. Geometrical isomers differ in [2002] (a) position of functional group (b) position of atoms (c) spatial arrangement of atoms (d) length of carbon chain Ans: (c) 61. Name of the compound given below is CH3 CH3 CH3 H3C [2003] (a) 5-ethyl-6-methyloctane (b) 4-ethyl-3-methyloctane (c) 3-methyl-4-ethyloctane (d) 2, 3-diethylheptane Ans: (b) 62. The correct order of reactivity towards the electrophilic substitution of the compounds aniline , benzene (II) and nitrobenzene (III) is (a) I> II> III (b) III> II> I[2003] (c) II> III> I (d) I< II> III Ans: (a) 63. Which one of the following is a free-radical substitution reaction? [2003] (a) CH3CHO (b) (c) (d) Ans: (b) 64. HCN••oCH3CH(OH) CN (a) CH3 +Cl2 CH2Cl Boiling (b) +CH3Cl Anh. AlCl CH3 3 (c) CH2Cl CH2NO2 + AgNO2


106

(d) Ans: (b) 65. Which of the following pairs of compounds are enantiomers? [2003] (a) CH3 CH3 HHOHOHand CH3 CH3 HOHHHO (b) CH3 CH3 HHOHOHand CH3 CH3 HOHHHO (c) CH3 CH3 HHOHOHand CH3 CH3 HOHHHO (d) CH3 CH3 HHOHOHand CH3 CH3 HOHOHH Ans: (a) 66. Number of chiral carbons in ED( (a) (b) (c) (d) Ans: (b) 67. ) glucose is [2004] (a) five (b) six (c) three (d) four Ans: (b) 68. Which of the following is least reactive in a nucleophilic substitution reaction. [2004] (a) (CH) CCl 3 3 (b) CHCHCl 2 (c) CHCHCl 3 2 (d) CHCHCHCl Ans: (a) 69. (a) (b) (c) (d) Ans: (b)

70. Disha Experts. 29 Years NEETAIPMTTopic wise Solved Papers CHEMISTRY1988 to 2016 11th Edition (Page 91) . . Kindle Edition. (a) (b) (c) (d) Ans: (d)

71. The molecular formula of diphenyl methane, CH2, is C13H12. How many structural isomers are possible when one of the hydrogens is replaced by a chlorine atom? [2004] (a) 6 (b) 4 (c) 8 (d) 7 Ans: (d) 72. The chirality of the compound HHCCl 3 Br Cis [2005] (a) R (b) S (c) E (d) Z Ans: (c) 73. Which one of the following pairs represents stereoisomerism? [2005] (a) Structural isomerism and Geometrical isomerism (b) Optical isomerism and Geometrical isomerism (c) Chain isomerism and Rotational isomerism. (d) Linkage isomerism and Geometrical isomerism Ans: (a) 74. Which of the following undergoes nucleophilic substitution exclusively by SN 1 mechanism? [2005] (a) Ethyl chloride (b) Isopropyl chloride (c) Chlorobenzene (d) Benzyl chloride Ans: (b) 75. Which amongst the following is the most stable carbocation? [2005] (a) CH3 (b) (c) (d) Ans: (c) 76. (a) CHCH3 2 (b) (c) (d) Ans: (c) 77. (a) CHCHCH3 3 † | (b) 3 | 3 | 3 CHCHCCH



107

(c) (d) Ans: (a) 78. (a) (b) (c) (d) Ans: (b) 79. Which one of the following compounds is most acidic? [2005] (a) Cl–CH2 –CH2 –OH (b) (c) (d) Ans: (c) 80. Names of some compounds are given. Which one is not correct in IUPACsystem? [2005] (a) 2 3 3 | 2 3 | 3 2 2 HCHCHCHHCCHCHCHCHCHC3-Methyl-4-ethyl heptane (b) 3 3 | | 3 3 Methyl 2 butanol CHCHCHCHOHCH (c) 32 3 || | 2 3 2 Ethyl 3 methyl but 1 ene CHCHCCHCHCHCH (d) 3 32 4 Methyl 2 pentyne CHCCCH(CH) { Ans: (a) 81. The best method for the separation of naphthalene and benzoic acid from their mixture is: [2005] (a) distillation (b) sublimation (c) chromatography (d) crystallisation Ans: (b) 82. The general molecular formula, which represents the homologous series of alkanols is [2006] (a) CnH2nO (b) CnH2n + 1O (c) CnH2n + 2O (d) CnH2n O2 Ans: (a) 83. The IUPACname of OCl is [2006] (a) 1- chloro -1-oxo - 2, 3- dimethyl pentane (b) 2-ethyl -3- methylbutanoyl chloride (c) 2, 3-dimethylpentanoyl chloride (d) 3, 4-dimethyl pentanoyl chloride Ans: (c)

84. The correct order regarding the electronegativity of hybrid orbitals of carbon is [2006] (a) sp > sp2 > sp3 (b) sp < sp2 > sp3 (c) sp < sp2 < sp3 (d) sp > sp2 < sp3 Ans: (c) 85. Which of the following is not chiral? [2006] (a) 2, 3- Dibromopentane (b) 3-Bromopentane (c) 2-Hydroxypropanoic acid (d) 2-Butanol Ans: (d) 86. (a) (b) (c) (d) Ans: (a) 87. Disha Experts. 29 Years NEETAIPMTTopic wise Solved Papers CHEMISTRY1988 to 2016 11th Edition (Page 92) . . Kindle Edition. (a) (b) (c) (d) Ans: (c) 88. Consider the following compounds. C6H5COCl (ii) ONCOCl 2 (iii) HCCOCl 3 (iv) OHCCOCl The correct decreasing order of their reactivity towards hydrolysis is [2007] (a) > (ii) > (iii) > (iv) (b) (iv) > (ii) > > (iii) (c) (ii) > (iv) > > (iii) (d) (ii) > (iv) > (iii) > Ans: (d) 89. If there is no rotation of plane polarised light by a compound in a specific solvent, though to be chiral, it may mean that [2007] (a) the compound is certainly meso (b) there is no compound in the solvent (c) the compound may be a racemic mixture (d) the compound is certainly a chiral. Ans: (b) 90. CH3 – CHCl – CH2 – CH3 has a chiral centre. which one of the following represents its R-configuration? [2007] (a) 2 5 3 CH| HCCH| Cl (b) 2 5 3 CH| Cl CCH| H


108

(c) 3 2 5 CH| HCCl | CH (d) 2 5 3 CH| HCCCl | H Ans: (d) 91. For I–, (ii) Cl–, (iii) Br–, the increasing order of nucleophilicity would be [2007] (a) Cl– < Br– < I– (b) I– < Cl– < Br– (c) Br– < Cl– < I– (d) I– < Br– < Cl– Ans: (d) 92. The order of decreasing reactivity towards an electrophilic reagent, for the following would be benzene (ii) toluene (iii) chlorobenzene (iv) phenol [2007] (a) (ii) > (iv) > > (iii) (b) (iv) > (iii) > (ii) > (c) (iv) > (ii) > > (iii) (d) > (ii) > (iii) > (iv) 84.. Which one of the following is most reactive towards electrophilic attack? [2008] Ans: (a) 93. Base strength of: HCCH3 2 4 HCCH2 4 and HCC4 { is in the order of: [2008] (a) > > (b) > > (c) > > (d) > > Ans: (a) 94. How many stereoisomers does this molecule have? CHCHCHCHCHBrCH3 23 [2008] (a) 4 (b) 6 (c) 8 (d) 2 Ans: (d) 95. Astrong base can abstract an D-hydrogen from: [2008] (a) alkene (b) amine (c) ketone (d) alkane Ans: (d) 96. The stability of carbanions in the following: (a) RCC4 (b) (c) RCCH2 4 (d) RCCH3 2 4 is in the order of: [2008] Ans: (b)

97. In the hydrocarbon CH– CH= CH– CH– CCH3 2 { 6 5 4 3 2 1 The state of hybrization of carbons 1, 3 and 5 are in the following sequence: [2008] (a) sp2, sp, sp3 (b) sp, sp3, sp2 (c) sp, sp2, sp3 (d) sp3, sp2, sp Ans: (a) 98. (a) (b) (c) (d) Ans: (d) 99. Disha Experts. 29 Years NEETAIPMTTopic wise Solved Papers CHEMISTRY1988 to 2016 11th Edition (3) . . Kindle Edition. (a) (b) (c) (d) Ans: (b) 100. The state of hybridization of C2, C3, C5 and C6 of the hydrocarbon, CH3 CH= CHC{CH7 5 4 2 1 CCHCH3 CH3 CH3 3 | | 6 | is in the following sequence: [2009] (a) sp3, sp2, sp2 and sp (b) sp, sp2, sp2 and sp3 (c) sp, sp2, sp3 and sp2 (d) sp, sp3, sp2 and sp3 Ans: (a) 101. Which of the following compounds will exhibit cis-trans (geometrical) isomerism? [2009] (a) Butanol (b) 2-Butyne (c) 2-Butenol (d) 2-Butene Ans: (a) 102. Given are cyclohexanol acetic acid (II) , 2, 4, 6 – trinitrophenol (III) and phenol (IV) . In these the order of decreasing acidic character will be: [2010] (a) III> II> IV> I (b) II> III> I> IV (c) II> III> IV> I (d) III> IV> II> I Ans: (c)


109

103. The correct order of increasing reactivity of C– Xbond towards nucleophile in the following compounds is: XNO2 NO2 X(CH3) 3 C– X, (CH3) 2CH– X (II) (III) (IV) [2010] (a) I< II< IV< III (b) II< III< I< IV (c) IV< III< I< II (d) III< II< I< IV Ans: (a) 104. Among the given compounds, the most susceptible to nucleophilic attack at the carbonyl group is: [2010] (a) CHCOOCH3 3 (b) CHCONH3 2 (c) CHCOOCOCH3 3 (d) CHCOCI3 Ans: (a) 105. Which one is most reactive towards electrophilic reagent? [2010] (a) CH3 OH (b) CH3 CHOH2 (c) CH3 NHCOCH3 (d) CH3 OCH3 Ans: (b) 106. In the following the most stable conformation of n-butane is: [2010] (a) HHHHCH3 CH3 (b) HHHHCH3 CH3 (c) HHHHCH3 CH3 (d) HHC3 HHCH3 H Ans: (a) 107. Which of the following conformers for ethylene glycol is most stable? [2010] (a) OHHOHHHH (b) OHHHHOHH (c) OHOHHHHH (d) OHHHHOHH Ans: (c) 108. (a) (b) (c) (d) Ans: (a) 109. Disha Experts. 29 Years NEETAIPMTTopic wise Solved Papers CHEMISTRY1988 to 2016 11th Edition (Page 94) . . Kindle Edition. (a) (b) (c)

(d) Ans: (a) 110. Among the following compounds the one that is most reactive towards electrophilic nitration is: [2012] (a) Benzoic acid (b) Nitrobenzene (c) Toluene (d) Benzene Ans: (a) 111. Which nomenclature is not according to IUPACsystem? [2012] (a) B2 2 r CHCHCH, 1-Bromo-prop-2-ene (b) CH3 CH3 CCH2 Br CH2 CHCH3 CH3 4 -Bromo, 2, 4 -di -methylhexane (c) CH3 CHCHCH2 CH3, CH3 2-Methyl-3-phenylpentane (d) CH3 CCH2 CH2 CHCOOH2 O5-oxohexanoic acid Ans: (c) 112. Which of the following acids does not exhibit optical isomerism? [2012] (a) Maleic acid (b) D-amino acids (c) Lactic acid (d) Tartaric acid Ans: (b) 113. Structure of the compound whose IUPACname is 3-ethyl-2-hydroxy-4-methylhex-3-en-5-ynoic acid is: [NEET2013] (a) OHCOOH (b) OHCOOH (c) COOHOH (d) COOHOH Ans: (d) 114. Some meta-directing substituents in aromatic substitution are given. Which one is most deactivating? [NEET2013] (a) –SO3H (b) –COOH (c) –NO2 (d) –C{ N Ans: (b) 115. Which of the following compounds will not undergo Friedal-Craft’s reaction easily: [NEET2013] (a) Xylene (b) Nitrobenzene (c) Toluene (d) Cumene Ans: (c)


110

116. The structure of isobutyl group in an organic compound is: [NEET2013] (a) CHCHCHCH3 23 ~ (b) CHCHCHCH3222 (c) CH3 | CH3 C_ CH3 (d) 3 2 3 CHCHCHCH Ans: (c) 117. Arrange the following in increasing order of stability 32 2 3 (CH) CCHCH† 3 3 (CH) C† 3 2 (CH) CH† CHCH3 2 † CH3 † [NEETKar. 2013] (a) E< D< C< B< A (b) E< D< C< A< B (c) D< E< C< A< B (d) A< E< D< C< B Ans: (b) 118. Given and IIIBr CH3 HCH3 HBr HBr Br CH3 CH3 HIand IIare [NEETKar. 2013] (a) Apair of optical isomers (b) Identical (c) Apair of conformers (d) Apair of geometrical isomers Ans: (c) 1.

2.

3.

4.

5.

6.

7.


111

8.

9.

10.

11.

12.

13.

14.

15.

16.

17.

18.

19.

20.

21.

22.


112

23.

24.

25.

26.

27.

28.

29.

30.

31.

32.


113

33.

34.

35.

36.

37.

38.

39.

40.

41.

42.

43.


114

44.

45.

46.

47.

48.

49.

50.

51.

52.

53.

54.


115

55.

56.

57.

58.

59.

60.

61.

62.

63.


116

64.

65.

66.

67.

68.

69.

70.


117

71.

72.

73.

74.

75.

76.

77.

78.

79.


118

80.

81.

82.

83.

84.

85.

86.


119

87.

88.

89.

90.

91.

92.

93.


120

94.

95.

96.

97.

98.

99.

100.

101.

102.

103. 104.

105.

106.


121

107.

108.

109.

110.

111.

112.

113.

114.

115.

116.

117.

118.

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