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5., , Which of the following compound is only acyclic ?, (A) alkane, , 6., , (B) alkene, , 8., , (B) n–hexane, , (D) n–butane, , (A) 2, 3–dimethyl butane, , (B) 2, 2 dimethyl butane, , (C) neo pentane, , (D) 2, 2, 3 trimethyl pentane, , How many tertiary carbon atoms are present in 2, 3 dimethyl butane ?, (B) 2, , (C) 3, , (D) 4, , Number of 1o, 2o, and 3o hydrogen atoms present in neopentane are ...... respectively., (A) 0, 12, 6, , 10., , (C) neopentane, , In which of the following hydro carbon compound all four types of carbon (1o, 2o, 3o, 4o) are, present ?, , (A) 1, 9., , (D) arene, , Which hydro carbon has 4o carbon ?, (A) isobutane, , 7., , (C) alkyne, , (B) 12, 2, 0, , (C) 6, 2, 0, , (D) 12, 1, 1, , (C) C9H18, , (D) C7H16, , ...... is example of alkyne., (A) C5H8, , (B) C8H16, , Answers : 1. (C), 2. (B), 3. (B), 4. (C), 5. (C), 6. (C), 7. (D), 8. (B), 9. (B), 10. (A), , ˆ General information, Nomenclature and isomerism in alkane, ˆ General Information :, , ®, ®, ®, ®, ®, , sp3 hybridization and tetrahedral shape., C – C and C – H bond length 154 and 112 pm.respectively, H – C – H bond angle 109o 28', Nomenclature : Refer Unit : 20, Isomerism :, , In alkane chain isomerism and conformational isomerism is observed. Out of which chain, isomerism is discussed in unit 20., Conformational isomerism : In alkane C – C single bond can rotate along with its bond, axis. As a result hydrogen or atoms connected with both carbon can arranged at different distance, and various spatial arrangement become possible. These are known as conformer isomers or, rotamers. Out of these two isomers staggerd and eclipsed are important other isomers are in, between two out of which skew or gauche is also important onc., Two conformer of ethane are as follows :, Newmann projection, H, H, , Sawhorse projection, H, , H, , H, , H, , H, , H, , H, H, , H, , H, , H, H, , H, H, , H H, , H, , Staggered, , H, , H, , H, , Eclipsed, , Staggered, , 491, , H, H, , Eclipsed

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ˆ In staggered structure hydrogen of both carbon are arranged far from each other hence repulsion, , is less so it is more stable. (dihedral angle 180°), ˆ In eclipsed structure hydrogen of both carbon are arranged closer (in diff plane) from each other, , hence, repulsion is more so stability is less (dihedral angle 0°), ˆ Out of staggered and eclipsed, staggered is more stable., ˆ Stability order for conformers of butane is as follows :, , Staggered (anti) > Skew or Gauche > Partially eclipsed > Fully eclipsed, ˆ In cyclohexane chair and boat conformers are observed out of which chair conformer is more, , stable., 11., , In alkane compound C – H bond length and, H – C – H bond angle is ...... respectively., (A) 112 pm 120o, (B) 112 pm, 109o 281, (C) 154 pm, 109o 281, (D) 135 pm, 180o, , 12., , Which of the following is the structure of isobutyl group ?, (B) CH3 – CH – CH2 –, , (A) CH3 – CH2 – CH2 – CH2 –, , CH3, (C) CH3 – CH – CH2 – CH3, 13., , 14., , 15., , Which sentence is incorrect with reference to isopentane ?, (A) It has three methyl group., , (B) It has only one – CH2 group., , (C) It has one – CH group ., , (D) It has one quaternary carbon, , Which of the following compound has isopropyl group ?, (A) 3, 3–dimethyl pentane, , (B) 2, 2, 3, 3–tetramethyl pentane, , (C) 2–methyl pentane, , (D) 2, 2, 3–tri methyl pentane, , Acidic saturated hydrocarbon has molor mass 72 gm/mol then how many isomers are possible for, it ?, (A) 2, , 16., , (B) 4, , (C) 5, , (D) 3, , (C) C2H6, , (D) C2H2Br2, , C – H bond length is least in ......, (A) C2H2, , 17., , (D) (CH3)3 – C –, , (B) C2H4, , Which of the following is staggered conformer of ethane ?, H, , H, , H, , H, , H, , (A), , (B), H, , H, , H, , H, , H, , H, , H, , H, H, , (C), , (D) None of the three., , H, H, , H, , H, , 492

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21., , Conversion of but–1–ene into but-2-ene is done by reacting it with ......., (A) Pd / H2, , 22., , 23., , (A) Wurtz reaction, , (B) Grignard reaction, , (C) Catalytic hydrogenation, , (D) Frank land reaction, , 29., , 35., , (D) all the given, , (B) Grignard reaction, , (C) reduction, , (D) both (B) and (C), , (B) ethane, , (C) ethene, , (D) acetic acid, , (C) 2-methyl butane, , (D) 2, 2-dimethyl propane, , Boiling point of neopentane is more than ...... ., (B) n-pentane, , (C) butane, , (D) n-hexane, , Benzene obtained from n-hexane by ...... reaction., (B) Craking, , (C) rearrangement, , (D) cydization, , Kerosene is a mixture of ...... ., (B) aromatic compounds, , (C) alcohols, , (D) CO + H2, , Which compound gives methane by reaction with water ?, (B) CaC2, , (C) VC, , (D) SiC, , → CH3CH2CH3 which reagnet is appropriate ?, For following conversion CH3CH2COOH , (A) LiAlH4, , 34., , (C) decarboxcylation, , (B) n-pentane, , (A) Al4C3, 33., , (B) water reaction, , (A) n-hexane, , (A) alkanes, 32., , (D) Grignard reaction, , ...... has highest boiling point., , (A) isomerism, 31., , (B) Frankland reaction (C) Hydrogenation, , Kolbe’s electrolysis of sodium acetate gives ...... ., , (A) iso pentane, 30., , (D) sp3 to sp, , By which method alkene having same no of carbon can be prepared from halo alkane ?, , (A) methane, 28., , (C) sp to sp3, , Preparation of methane can be done by ......, , (A) Wurtz reaction, 27., , (B) sp2 to sp3, , By which reaction butane can be prepared from ethyl chloride in one step ?, , (A) hydrogenation, 26., , (D) Zn – Hg, , In preparation of propane from propyne hybridization of carbon changes from ......, , (A) Wurtz reaction, 25., , (C) Sn / HCl, , By which method propane can be obtained form propene ?, , (A) sp2 to sp, 24., , (B) Zn / HCl, , (B) Sodalime, , (C) Red P / HI, , (D) Zn / HCl, , Halogenation of alkane is example of which of the following ?, (A) Electrophilic substituion, , (B) Nuclcophilic substitution, , (C) Free radical substitution, , (D) addition reaction, , Which parafin is solid at room temperature ?, (A) C3H8, , (B) C8H18, , (C) C4H10, , (D) C20H42, , Answers : 21. (A), 22. (C), 23. (C), 24. (A), 25. (C), 26. (D), 27. (B), 28. (A), 29. (C),, 30. (D), 31. (A), 32. (A), 33. (C), 34. (C), 35. (D), , 495

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ˆ General information, Nomenclature and isomerism of alkene, ˆ sp2 hybridization and trigonal plannar shape, ˆ C – C and C – H bond length 134 and 110 pm respectively, ˆ H – C – H bond angle 116o6’ and C – C – H bond angle 121o7’, ˆ Nomenclature : Refer Unit : 20, ˆ Isomerism : Alkene has position isomerism, chain isomerism and geometrical isomerism, , position isomerism is discussed in unit 20., ˆ Geometrical isomerism : In some alkene compounds though their molecular and structural, , formula are same but atoms or groups arranged differently in space in different direction., Which is called geometrical isomerism. Geometrical isomers shown by cis and trans., ˆ This isomerism is observed in planner molecule having C = C., ˆ Due to restricted rotation around C = C geometrical isomerism arises., ˆ Two isomers of but–2–ene are as follows :, , CH3, , CH3, , CH3, C=C, H, , or, , H, , H, C=C, CH3, , H, , cis but-2-ene, , trans but-2-ene, , ˆ Geometrical isomerism is observed in compounds like ab C = C ab, ab C = C ad ab C = C, , de but it is not observed in the compounds like ab C = C bb or aa C = Cab type of, compounds., ˆ cis isomer is polar while trans isomer is non-polar., ˆ cis isomer has greater solubilly in water than trans isomer., , 36., , In ethene C = C and C – H bond length is ...... respectively., (A) 134, 112, , 37., , (C) 134, 110, , (D) 139, 110, , (C) octahedral, , (D) trigonal plannar, , Shape of ethene molecule is ...... ., (A) linear, , 38., , (B) 154, 112, , (B) tetrahedral, , IUPAC name of (CH3)2 . CH – CH = CH – CH = CH is ...... ., CH – CH3, C2H5, (A) 2, 7–dimethyl nona 3, 5–diene, , (B) 2, 7–dimethyl octa–3, 5–diene, , (C) 2–ethyl 7–methyl octa–3, 5–diene, , (D) 7–methyl non–3–ene, , 496

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64., , Propene on reaction with HI gives isopropyl iodide not n-propyl iodide because ......, (A) Reaction takes place by more stable carbonium ion., (B) Reaction takes place by more stable free radical., (C) Reaction takes place by more stable carbonium ion., (D) none of the above., , 65., , Identify B in the following reaction sequence :, CH3 – CH = CH – CH3, (A) 2CH3CHO, , O3, , A, , Zn, B, H2O, , (B) 2CH 3COCH 3, , (C) 2CH 3COOH, , (D) CH3CH2CH2CH3, , Answers : 46. (B), 47. (C), 48. (D), 49. (D), 50. (A), 51. (B), 52. (C), 53. (D), 54. (C),, 55. (B), 56. (A), 57. (C), 58. (A), 59. (C), 60. (B), 61. (C), 62. (B), 63. (D),, 64. (A), 65. (A), , ˆ General Information, Nomenclature and isomerism of alkyne, ˆ General information : sp hybridization and linear shape., ˆ C ≡ C and C – H bond length 120 and 106 pm respectively., ˆ Bond angle 180o, ˆ Nomenclature : Refer Unit : 20, ˆ Isomerism : In alkyne position, chain and ring chain isomerism is observed., , 66., , Compound with which of the following bound is most reactive ?, (A) C – C, , 67., , 71., , (D) All, , (B) sp2, , (C) sp3, , (D) dsp 2, , (B) 1 pi 2 sigma, , (C) 3 sigma, , (D) 3 pi, , IUPAC name of (CH3)3 C – C ≡ C – C (CH3)3 is ...... ., (A) 3, 3, 4, 4–tetra methyl Hex–3–yne, , (B) 2, 2, 5, 5–tetra methyl Hex–3–yne, , (C) 2, 2, 5, 5–tetra methyl Hex–4–yne, , (D) di(trimethyl)–2–yne, , How many alkyne isomers are possible for compound having molecular formula C5H8 ?, (A) 2, , 72., , (C) Propyne, , Triple bond between two carbon in alkyne is formed by ...... ., (A) 1 sigma 2 pi, , 70., , (B) Propene, , Hybridization of second carbon in buta 1, 2–diene is ...... ., (A) sp, , 69., , (D) All, , In which of the following compound all atoms are linearly bonded ?, (A) Propane, , 68., , (C) C ≡ C, , (B) C = C, , (B) 4, , (C) 3, , (D) 5, , (C) Propene, , (D) Propane, , Which of the following is isomer of propyne ?, , (A) Cyclo propyne, , (B) Cyclo propene, , Answers : 66. (C), 67. (C), 68. (A), 69. (A), 70. (B), 71. (C), 72. (B), , 501

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73., , Colourless gas obtained by reaction between metal carbide and water is ...... ., (A) Methane, , 74., , →, , 79., , 80., , 1, 2–di bromo ehtane on reaction with alcoholic KOH gives ...... ., (B) acetylene, , (C) ethylene, , (D) methane, , Product obtain by reaction between haloalkene and sodamide is ...... ., (B) alkene, , (C) alkyne, , (D) holo alkane, , Which of the following compound has acidic hydrogen ?, (B) ethyne, , (C) propyne, , (D) both (B) and (C), , By which of the following reaction propyne is formed ?, (A) CH3Br with acetylene, , (B) CH3Br with sodium acetylide, , (C) CH3I with sodium acetate, , (D) Methane with ethene, , Oxidation of but-1-yne by hot alkaline KMnO4 gives ...... ., (A) CH3CH2CH2COOH, , (B) CH3CH2COOH, , (C) CH3CH2COOH + CO2 + H2O, , (D) CH3CH2COOH + HCOOH, , ...... is obtained by reaction between acetylene and ethyl magnesium bromide., (B) Ethane, , (C) but-1-ene, , (D) but–2–ene, , Final product of reductive ozonolysis of but–2–yne is ...... ., (A) glyoxal, , 82., , Y, , HgSO4, , (D) X–acetylene Y–ethenol, , (A) Butane, 81., , dilH2SO4, , (C) X–ethane Y–ethanol, , (A) ethene, 78., , X, , (B) X–acetylene Y–ethanol, , (A) alkane, 77., , (D) ethylene, , (A) X–ethylene Y-acetaldehyde, , (A) ethane, 76., , (C) acetylene, , Identify X and Y in the following reaction :, CaC2(S) + H2O(1), , 75., , (B) ethane, , (B) 2CH 3COOH, , (C) but 2, 3 – dione, , (D) butanal, , (C) CH – Cl, , (D) None, , Final product of C2H2 with HCl is ......, (A) CH = CH – Cl, , (B) CH3 – CHCl2, , CH – Cl, 83., 84., , 85., , HgCl2, product., CH ≡ CH + HCl, (A) Methyl chloride, (B) Dichloro ethane, , (C) Vinyl chloride, , (D) Ethyl chloride, , Which final product is obtained by reaction of propyne with dilute H2SO4 in presence of, HgSO4., (A) propanal, (B) propyl hydrogen sulphate, (C) propanal, (D) acetone, ...... type of reactions are given by alkyne compounds., (A) substitution, (B) addition, (C) polymerization, (D) all, , Answers : 73. (C), 74. (D), 75. (B), 76. (C), 77. (D), 78. (B), 79. (C), 80. (B), 81. (C),, 82. (B), 83. (C), 84. (D), 85. (D), , 504

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ˆ Arene (aromatic hydro carbon) General information, Nomencluture and structure of benzene, ˆ Compounds having benzene ring are called aromatic compounds., ˆ Aromatic compounds having only carbon and hydrogen are called aromatic hydrocarbon or arene., , Their first member is benzene., ˆ General formula of arene is CnH2n, , – 6m, , where m = number of rings, , ˆ Aromatic compounds having benzene ring are called benzanoids. eg. biphenyl, napthalene,, , anthracene, phenanthrene, napthacene, ˆ Aromatic compounds which do not have benezene ring are called non-benzaoids. eg. pyrol, furan,, , thiofin, pyridine., , ˆ Nomencluture, ˆ By displacing hydrogen of benzene with other group substituted benzene can be obtained., , CH3, , NO2, , CH3, , CH3, , CH3, , CH3, , CH3, CH3, benzene, , nitro benzene, methyl, benzene (Toluene), , o– xylene, , m –xylene, , p– xylene, , ˆ Structure of Benzene, ˆ Molecular formula of benzene is C6H6. It has hexagonal cyclic structure with alternate C – C and, , C = C., ˆ Resonating structure of benzene as per kekule is as follows :, , ˆ Mono substituted benzene has only one isomer while disubstituted has three isomers (or the, , meta and para), ˆ Benzene has less chemical reactivity and greater stability is called aromatic character., ˆ Benzene follows (4n + 2), , 86., , Which of the following is aromatic hydrocarbon ?, (A) cyclohexane, , 87., , (D) aniline, , (B) C6H12, , (C) C10H8, , (D) C14H10, , (B) Aniline, , (C) Pyridine, , (D) Napthacene, , Reaction of benzene with 3 moles Cl2 in presence of sunlight gives ...... product., (A) C6H3Cl3, , 90., , (C) phenol, , Which of the following is non benzanoid ?, (A) Napthalene, , 89., , (B) toluene, , Molecular formula of anthracene is ...... ., (A) C6H6, , 88., , pe– rule of Huckel hence it is aromatic., , (B) C6Cl6, , (C) C6H6Cl6, , (D) C6H5Cl, , (C) chloral, , (D) hexa chlorethane, , Chemical name of pesticide gamaxene is ...... ., (A) DDT, , (B) BHC, , 505

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91., , Carbon-carbon bond length in benzene is ...... pm., (A) 154 and 134, , 92., , (B) only 134, , (B) 10, , (B) addition, , (D) benzone, , (C) 12, , (D) 14, , (C) oxidation, , (D) all the given, , How many s and p bonds are present in biphenyl respectively ?, (A) 22 and 6, , 96., , (C) glyoxal, , Benzene shows ...... type of reaction., (A) substitution, , 95., , (B) acetaldehyde, , According to Huckel’s rule how many pe–s are present in phenanthrene ?, (A) 6, , 94., , (D) 139, , Which product is obtained by ozonolysis of benzene followed by hydorlysis of product ?, (A) Benzenetriozonide, , 93., , (C) only 154, , (B) 23 and 6, , (C) 13 and 5, , (D) 12 and 6, , Which of the following sentence is correct for benzene ?, (A) Due to unsaturation benzen gives addition reaction easily., (B) In benzen 3 types of C–H bond., (C) In benzene cyclic delocalized p bonds are present., (D) In benzene 6p electrons are localized., , 97., , Number of s and p bonds in phenol are ...... respectively., (A) 13, 2, , 98., , (B) 12, 3, , 100., , (D) 13, 4, , What is the hybridization of all six carbon in benzene ?, (B) sp2, , (A) sp, 99., , (C) 13, 3, , (C) sp3, , (D) sp2 and sp3, , Why benzene has higher stability and less reactivity ?, (A) sp3 hybridization of six carbon atom, , (B) cyclic structure of six carbon atom, , (C) high resonance energy, , (D) unsaturated nature of benzene ring, , Which compound do not follow Huckel’s rule ?, (A) Benzene, , (B) Cyclohexane, , (C) Napthalene, , (D) Pyrol, , Answers : 86. (B), 87. (D), 88. (C), 89. (C), 90. (B), 91. (D), 92. (C), 93. (D), 94. (D),, 95. (B), 96. (C), 97. (C), 98. (B), 99. (C), 100. (B), , ˆ Preparation of Benzene, ˆ By cyclic polymerization of ethyne, , 3CH ≡ CH, , red hot Fe tube, 873 K, , ˆ By decarboxylation of sodium benzoate, , COONa, , sodalime, NaOH + CaO, , + Na2CO3, , ˆ By reduction of phenol, , 506

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101., , By which reaction of phenol, benzene can be obtained ?, (A) oxidation, , 102., , 107., , (C) –C6H 5, , (D) –Br, , (B) –Cl, , (C) –CH 3, , (D) –COCH 3, , (B) chloro benzene, , (C) ethyl benzoate, , (D) toluene, , Electrophilic ion substituted during acylation of benzene is ...... ., (A) +CH3, , 106., , (B) –Cl, , Which of the following compound produces meta product during chlorination?, (A) ethoxy benzene, , 105., , (D) cyclization, , due to inductive effect of which group in benzene substitution takes place at meta position ?, (A) –NH 2, , 104., , (C) decarboxilation, , Which of the following is strongest o/p directive group ?, (A) –OH, , 103., , (B) reduction, , (B) CH 3–, , (C) +SO3H, , (D) CH3+CO, , Product obtained by nitration of benzene is ...... (Temperature 323 K), (A) nitro benzene, , (B) nitroso benzene, , (C) O-dinitro benzene, , (D) m–dinitrobenzene, , Product obtained by reaction of benzene with concentrated HNO3 and, , H2SO4 of 353 to, , 363 K temperature is ...... ., , 108., , (A) benzene sulphonic acid, , (B) nitro benzene, , (C) m–dinitro benzene, , (D) (o and p) dinitro benzene, , Which of the following compound is most reactive towards electrophilic aromatic substitution, reaction ?, (A) benzene, , 109., , (C) benzoic acid, , (D) nitro benzene, , In which of the following compound second substituion is difficult ?, (A) toluene, , 110., , (B) toluene, , (B) chloro benzene, , (C) phenol, , (D) aceto phenone, , At which position new group will enter during nitration of toluene ?, (A) ortho, , (B) meta, , (C) para, , (D) ortho + para, , Answers : 101. (B), 102. (A), 103. (D), 104. (C), 105. (D), 106. (A), 107. (C), 108. (B),, 109. (D), 110. (D), , ˆ Reaction and conversion of toluene, Reaction of phenyl group in toluene :, ˆ Toluene also gives electrophillic substitution reaction like benzene for eg. nitration, sulphonation,, , chlorination, bromination, alkylation, acylation etc., ˆ – CH3 group in toluene is ortho-para directive group hence second substitution takes place at ortho, , and para position. (Study the reactions from Textbook.), , 508

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Instruction : For question no. 121 to 125 for correct sentence T and for incorrect sence F then, select correct option :, 121., , (i), , Each ‘carbon in benzene is sp2 hybridized., , (ii) In benzene C–C bondlength is 154 and 134 para alternatively., (iii) In benzene 6p electrons are loalized., (iv) In benzene 6 carbon and 6 hydrogen are identical., (A) TFFT, 122., , (i), , (B) FTFT, , (C) TTFF, , (D) TTTF, , At normal temperature benzene gives addition reaction with H2, Cl2 and O3 ., , (ii) Benzene gives nucleophilic substitution reaction easily., (iii) Reactivity of benzene is more than alkene., (A) TFT, 123., , (i), , (B) TTT, , (C) TTF, , (D) FFF, , Benzene is plannar., , (ii) In benzene cyclic shaped molecular orbital of 6p electron., (iii) Due to resonance reactivity of benzene increases., (iv) Benzene is insoluble in water., (A) TTFT, 124., , (i), , (B) TTFF, , (C) FTTF, , (D) TTFF, , –NHCH3 is meta directing group., , (ii) Chlorination of benzoic acid gives O–chloro benzoic acid., (iii) TNT is used as explosive., (iv) Ozonolysis of benzene gives addition reaction., (A) TFFT, 125., , (i), , (B) TTFT, , (C) FFTT, , (D) FFTF, , Chlorobenzene gives Friedel Craft reaction., , (ii) –OH group is electron donor group., (iii) Nitration of benzene done by nucleophile +NO2., (iv) Benzene burns with sooty flame., (A) TTFT, , (B) TFFF, , (C) FTTF, , (D) TFFT, , Instruction : Read the paragraph carefully and answer the questions below it., Paragraph : The compound or ions which follows Huckel’s rule are called aromatic, compounds. Main important point of this law are as follows :, (i), , Compound or ion must be plannar., , (ii) It has delocalized p electron coloured., (iii) p electron cloud should cover all the carbon atom of cyclic system., (iv) Total number of p e– should be 4n + 2 where n = 0, 1, 2, ....., 126., , Which of the following compound is not aromatic ?, (A), , 127., , (B), , (C), , (D), , Which of the following system is aromatic ?, , +, (A), , H, , +, , (B), , (C), , 511, , (D)

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128., , Which of the following compound is aromatic ?, , (A), , (B), N, H, Pyrol, , ˆ, 129., , 130., , 131., , ˆ, , (C), , (D) all, , S, Thiofene, , Furan, , In question 129 to 131 column-I and column-II aer given match them and select correct option :, Column-I, , Column-II, , (1) alkane, , (p) CnH2n–2, , (A) (1)−(r), (2)−(q), (3)−(p), (4)−(s), , (2) alkene, , (q) CnH2n, , (B) (1)−(p), (2)−(q), (3)−(r), (4)−(s), , (3) alkyne, , (r) CnH2n+2, , (C) (1)−(s), (2)−(r), (3)−(q), (4)−(r), , (4) arene, , (s) CnH2n–6m, , (D) (1)−(r), (2)−(s), (3)−(p), (4)−(q), , Column-I (Reaction), , Column-II (Hydro carbon product), , (a) decarboxylation of sodium acetate, , (p) ethyne, , (b) Wurtz reaction, , (q) 2–methyl propane, , (c) Correy-House reaction, , (r) n–butane, , (d) dehydro halogenation, , (s) methane, , (A) (a)−(r), (b)−(p), (c)−(q), (d)−(s), , (B) (a)−(s), (b)−(r), (c)−(q), (d)−(p), , (C) (a)−(q), (b)−(s), (c)−(r), (d)−(p), , (D) (a)−(p), (b)−(q), (c)−(s), (d)−(r), , Column-I (Reaction), , Column-II (Reagent), , (a) CH3COCH3 → CH3CH2CH3, , (p) Sodalime, , (b) CH3CH2Br → CH2 = CH2, , (q) Zn powder, , (c) C6H5COOH → C6H6, , (r) alcoholic KOH, , (d) C6H5OH → C6H6, , (s) HI / Red P, , (A) (a)−(p), (b)−(s), (c)−(q), (d)−(r), , (B) (a)−(q), (b)−(p), (c)−(s), (d)−(r), , (C) (a)−(s), (b)−(r), (c)−(p), (d)−(q), , (D) (a)−(s), (b)−(q), (c)−(r), (d)−(p), , In the following questions two sentences are given out of which one is assertion (A) and, other is reason (R). Study the sentences given below properly and select the open given, below :, (A) Assertion (A) and reason (R) both are correct and reason (R) is correct explanation of, assertion (A)., (B) Assertion (A) and reason (R) both are correct but reason (R) is not correct explanation, of assertion (A)., (C) Assertion (A) is correct while reason (R) is incorrect., (D) Assertion (A) is incorrect while reason (R) is correct., , 512

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132., , 133., , Assertion (A) : Stability of benzene is less than alkene, Reason, (R) : Resonance energy of benzene indicates it’s greater stability and less chemical, reactivity., Assertion (A) : cis but–2–ene is polar while trans but-2-ene is non polar., Reason, , 134., , Assertion (A) : Though benzene has double bond it does not undergo polymerization., Reason, , 135., , (R) : This reaction takes place by free radical intermediate., , Assertion (A) : Cyclopenta dienyl anion is more stable than allyl anion., Reason, , 140., , (R) : Benzene is unsaturated hydro carbon., , Assertion (A) : By addition reaction of propene with HCl in presence of peroxide mainly gives, 2-chloro propane., Reason, , 139., , (R) : Dehydration takes place mainly through carbocation intermediate., , Assertion (A) : Benzene easily gives electrophilic substitution reaction., Reason, , 138., , (R) : neo-pentane has quaternary carbon., , Assertion (A) : Dehydration of butan-2-ol mainly gives but-2-ene., Reason, , 137., , (R) : In normal condition benzene does not behave as alkane., , Assertion (A) : Compared to n-pentane boiling point of neo pentane is more., Reason, , 136., , (R) : In trans isomer both methyl groups are on opposite sides hence net dipole, moment is zero., , (R) : Cyclopenta dienyl anion is aromatic., , Assertion (A) : Reaction of acetylene with sodamide gives sodium acetylide and ammonia., Reason, , (R) : sp hybridized carbon of atoms acetylene are highly electro negative., , Answers : 111., 119., 127., 135., , (D),, (D),, (B),, (B),, , 112., 120., 128., 136., , (C),, (D),, (D),, (D),, , 113., 121., 129., 137., , (B), 114. (B), 115. (C), 116. (D), 117. (C), 118. (C),, (A), 122. (D), 123. (A), 124. (C), 125. (A), 126. (B),, (A), 130. (B), 131. (C), 132. (D), 133. (D), 134. (C),, (B), 138. (D), 139. (A), 140. (A)., , ˆ, , 513