General Organic Chemistry PYQs Set 3 (PDF)

Set 3 of 22 · Questions 61-90 of 650

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Mere Teacher · Previous Year Questions NEET Chemistry · General Organic Chemistry · Set 3 (Q61-90)
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61. $Sodium fusion extract of aniline when heated with ferrous sulphate solution and then acidified with concentrated H_{2} SO_{4} from which of the following complexes?$ (1) $(Fe (CN)_{6})^{4}$ (2) $Fe_{4} (Fe (CN)_{6})_{3} \cdot x H_{2} O$ (3) $[Fe (SCN)]^{2 +}$ (4) $(Fe (CN)_{5} NOS)^{4 -}$ 62. $Which of the following is used as an antiknocking material?$ (1) $Glyoxal$ (2) $Freon$ (3) $TE.L.$ (4) $Ethyl alcohol$ 63. $In Carius method, 0.75 g of an organic compound gave 1.2 g of barium sulphate, find percentage of sulphur (molar mass 32 g mol^{- 1}). Molar mass of barium sulphate is 233 g mol^{- 1} .$ (1) $10.30 %$ (2) $16.48 %$ (3) $21.97 %$ (4) $4.55 %$ 64. $A miscible mixture of C_{6} H_{6} + CHCl_{3} can be separated by$ (1) $sublimation$ (2) $distillation$ (3) $filtration$ (4) $crystallisation.$ 65. $The correct statement among the following, for a "chromatography" purification method is :$ (1) $Organic compounds run faster than solvent in the thin layer chromatographic plate.$ (2) $R_{f} is an integral value.$ (3) $R_{f} of a polar compound is smaller than that of a non-polar compound.$ (4) $Non-polar compounds are retained at top and polar compounds come down in column chromatography.$ 66. $In Lassaigne sodium fusion test, N and S of an organic compounds are converted into$ (1) $NaCN$ (2) $Na_{2} S$ (3) $NaCNS$ (4) $NaNS$ 67. $In case of substituted aniline, the group which derreases the basic strength is$ (1) $- OCH_{3}$ (2) $- CH_{3}$ (3) $- NH_{2}$ (4) $- C_{6} H_{5}$ 68. $In Carius method 0.2425 g of an organic compound gave 0.5253 g silver chloride. The percentage of chlorine in the organic compound is$ (1) $34.79 %$ (2) $37.57 %$ (3) $87.65 %$ (4) $53.58 %$ 69. $In 1 C H_{2} = 2 C = 3 CH - 4 C H_{3} molecule, the hybridization of carbon 1, 2, 3 and 4 respectively are:$ (1) $sp², sp, sp², sp³$ (2) $sp², sp², sp², sp³$ (3) $sp², sp³, sp², sp³$ (4) $sp³, sp, sp³, sp³$ 70. $The difference in energy between the actual structure and the lowest energy resonance structure for the given compound is$ (1) $electromeric energy$ (2) $resonance energy$ (3) $ionization energy$ (4) $hyperconjugation energy$ 71. $Match List I with List II List I (Compound) A. Ethanol B. Phenol C. m-Nitrophenol D. p-Nitrophenol List II (pK value) I. 10.0 II. 15.9 III. 7.1 IV. 8.3 Choose the correct answer from the options given below :-$ (1) $A-I, B-II, C-III, D-IV$ (2) $A-IV, B-I, C-II, D-III$ (3) $A-III, B-IV, C-I, D-II$ (4) $A-II, B-I, C-IV, D-III$ 72. $25 g of an unknown hydrocarbon upon burning produces 88 g of C O_{2} and 9 g of H_{2} O . This unknown hydrocarbon contains:$ (1) $20 g of carbon and 5 g of Hydrogen$ (2) $22 g of carbon and 3 g of Hydrogen$ (3) $24 g of carbon and 1 g of Hydrogen$ (4) $18 g of carbon and 7 g of Hydrogen$ 73. $Which of the following statement is correct for paper chromatography?$ (1) $Water present in the pores of the paper forms the stationary phase.$ (2) $Paper sheet forms the stationary phase.$ (3) $Water present in the mobile phase gets absorbed by the paper which then forms the stationary phase.$ (4) $Paper and water present in its pores together form the stationary phase.$ 74. $The organic chloro compound, which shows complete stereochemical inversion during an S_{N} 2 reaction, is:$ (1) $(C H_{3})_{3} CCl$ (2) $(C H_{3})_{2} CHCl$ (3) $C H_{3} Cl$ (4) $(C_{2} H_{5})_{2} CHCl$ 75. $In Kjeldahl's method for estimation of nitrogen, CuSO_{4} acts as :$ (1) $Reducing agent$ (2) $Catalytic agent$ (3) $Hydrolysis agent$ (4) $Oxidising agent$ 76. $The dipole moments of CHCl_{3}, CCl_{4} and C H_{4} are in the order:$ (1) $CHC l_{3} > CC l_{4} = C H_{4}$ (2) $CHC l_{3} > CC l_{4} > C H_{4}$ (3) $CC l_{4} > CHC l_{3} > C H_{4}$ (4) $CC l_{4} = C H_{4} > CHC l_{3}$ 77. $Reactivity order of halides for dehydrohalogenation is$ (1) $R - F > R - Cl > R - Br > R - I$ (2) $R - I > R - Br > R - Cl > R - F$ (3) $R - I > R - Cl > R - Br > R - F$ (4) $R - F > R - I > R - Br > R - Cl$ 78. $For which of the following, Kjeldahl's method is not used for the estimation of nitrogen? I. Aniline II. Azobenzene III. Nitrobenzene IV. Pyridine$ (1) $II, III, IV$ (2) $II, III only$ (3) $III, IV only$ (4) $I, III, IV$ 79. $Which purification technique is used for high boiling organic liquid compound (decomposes near its boiling point)?$ (1) $Simple distillation$ (2) $Steam distillation$ (3) $Fractional distillation$ (4) $Reduced pressure distillation$ 80. $Which of the following fertilizers has the highest nitrogen percentage?$ (1) $Ammonium sulphate$ (2) $Calcium cyanamide$ (3) $Urea$ (4) $Ammonium nitrate$ 81. $Which of the following is the correct order of decreasing SN2 reactivity ?$ (1) $RCH2X > R3CX > R2CHX$ (2) $RCH2X > R2CHX > R3CX$ (3) $R3CX > R2CHX > RCH2X$ (4) $R2CHX > R3CX > RCH2X$ 82. $In Lassaigne's extract of an organic compound, both nitrogen and sulphur are present, which gives blood red colour with Fe^{3 +} due to the formation of$ (1) $[Fe (SCN)]^{2 +}$ (2) $Fe_{4} (Fe (CN)_{6})_{3} \cdot xH_{2} O$ (3) $NaSCN$ (4) $(Fe (CN)_{5} NOS)^{4 -}$ 83. $The strongest acid amongst the following compounds is :$ (1) $CH3COOH$ (2) $HCOOH$ (3) $CH3CH2CH(Cl)CO2H$ (4) $ClCH2CH2CH2COOH$ 84. $In a hydrocarbon, mass ratio of hydrogen and carbon is 1:3, the empirical formula of hydrocarbon is$ (1) $CH4$ (2) $CH2$ (3) $C2H$ (4) $CH3$ 85. $Which of the following acid has the lowest value of acid dissociation constant$ (1) $C H_{3} CHFCOOH$ (2) $F C H_{2} C H_{2} COOH$ (3) $B r C H_{2} C H_{2} COOH$ (4) $C H_{3} CHBrCOOH$ 86. $In which of the following hyper conjugation is not possible?$ (1) (2) (3) (4) $C H_{3} - C H_{2} - C \oplus H_{2}$ 87. $The most stable carbanion among the following is$ (1) (2) (3) (4) 88. $Statement-1 : Bromobenzene upon reaction with B r_{2} /Fe gives 1,4-dibromobenzene as the major product. Statement-2 : In bromobenzene, the inductive effect of the bromo group is more dominant than the mesomeric effect in directing the incoming electrophile.$ (1) $Statement-1 is True, Statement-2 is True; Statement-2 is a correct explanation for Statement-1.$ (2) $Statement-1 is True, Statement-2 is True; Statement-2 is NOT a correct explanation for Statement-1$ (3) $Statement-1 is True, Statement-2 is False$ (4) $Statement-1 is False, Statement-2 is True$ 89. $The decreasing order of the ratio of HCN addition to compounds A to D is (A) HCHO (B) C H_{3} C O C H_{3} (C) P h C O C H_{3} (D) PhCOPh$ (1) $D > B > C > A$ (2) $D > C > B > A$ (3) $C > D > B > A$ (4) $A > B > C > D$ 90. $For (i) I, (ii) Cl, (iii) Br, the increasing order of nucleophilicity would be$ (1) $C 1^{-} < B r^{-} < I^{-}$ (2) $I^{-} < C 1^{-} < B r^{-}$ (3) $B r^{-} < C 1^{-} < I^{-}$ (4) $I^{-} < B r^{-} < C 1^{-}$