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CSIR UGC NET 2011 : CHEMICAL SCIENCES - MODEL / SAMPLE PAPER

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CHEMICAL SCIENCES This Test Booklet will contain 145 (20 Part `A +50 Part `B+75 Part C ) Multiple Choice Questions (MCQs). Candidates will be required to answer 15 in part A , 35 in Part B and 25 questions in Parts C respectively ( No. of question to attempt may vary from exam to exam). In case any candidate answers more than 15, 35 and 25 questions in Parts A, B and C respectively only first 15, 35 and 25 questions in Parts A, B and C respectively will be evaluated. Questions in Parts `A and B ca rry two marks each and Part `C questions carry four marks each. There will be negative marking @25% for each wrong answer. Below each question, four alternatives or responses are given. Only one of these alternatives is the CORRECT answer to the question. MODEL QUESTION PAPER PART A May be viewed under heading General Science PART B 21. [CoCl4]2- shows a deep blue colour because of 1. 2. 3. 4. 22. metal to ligand charge transfer transition ligand to metal charge transfer transition spin allowed and Laporte forbidden d-d transition spin allowed and Laporte allowed d-d transition The violet colour of iodine vapour is due to 1. 2. 3. 4. n- * transition - * transition n- * transition *- * transition 23. Choose the correct statement among the following 1. 2. 3. 4. 24. Which of the following is a nido-borane? 1. 2. 3. 4. 25. both p and f orbitals have centre of symmetry both p and d orbitals have centre of symmetry only d orbitals have centre of symmetry f orbitals alone have centre of symmetry The absorbance of solution having 20% transmittance is 1. 2. 3. 4. 28. +3 and +4 +3 and +5 +4 and +5 +4 and +6 Among the three types of orbitals p, d, and f, 1. 2. 3. 4. 27. B4H10 B5H9 [B6H6]2B5H11 The oxidation number of sulphur in dithionite [S2O4]2- and dithionate [S2O6]2- are, respectively, 1. 2. 3. 4. 26. diamond has lower thermal and electrical conductivities compared to graphite diamond has similar thermal and electrical conductivities compared to graphite diamond has higher thermal conductivity but lower electrical conductivity compared to graphite diamond has the same thermal but lower electrical conductivity compared to graphite 0.301 0.699 1.301 1.699 The active site of enzyme nitrogenase contains 1. 2. 3. 4. Mo Mn Fe Cu 29. Which one of the following is a free radical: 1. 2. 3. 4. 30. Choose the 16 e complex from the following: 1. 2. 3. 4. 31. 3. 4. Fluorine has higher electronegativity than chlorine Fluorine molecule (F2) has lower bond energy than chlorine molecule (Cl2) Fluorine has higher electron affinity than chlorine Fluorine has a lesser tendency to form cation than chlorine The only molecule having bridging oxygen is 1. 2. 3. 4. 34. Mn2(CO)10 Al2(CH3)6 V2(O)12 Al2(OPri)12 Choose the INCORRECT statement from the following 1. 2. 33. Ni(CO)4 Rh(PPh3)3Cl Fe(CO)5 ( 6-C6H6)2Cr The species having metal-metal bond is: 1. 2. 3. 4. 32. CO C N NO CS Phosphorus trioxide Phosphorus pentaoxide Cyclic tetraphosphate Pyrophosphate The coordination number of phosphorus in [PMo12O40]3- is 1. 2. 3. 4. 2 4 5 6 35. Using phenolphthalein as the indicator, which of the following titration is possible: 1. 2. 3. 4. 36. Which of the following species is ESR-active? 1. 2. 3. 4. 37. O2 , O O2-, O2+ O22-, O+ atomic oxygen Large derivation from Trouton's rule is observed for systems which are 1. 2. 3. 4. 39. VOSO4 K2Cr2O7 KMnO4 [Co(NH3)6]Cl3 Ozone (O3) absorbs UV radiation in the atmosphere and is decomposed mainly into 1. 2. 3. 4. 38. acetic acid with pyridine oxalic acid with sodium hydroxide hydrochloric acid with aniline sulphuric acid with aqueous ammonia having more ordered structure having more disordered structure having low melting points having low boiling points The concentration of a reactant decreases linearly with time. What is the order of the reaction? [A] t 1. 2. 3. 4. 1st order Fractional order 2nd order Zero order 40. The point group symmetry of the molecule cis ML4 X2 is 1. 2. 3. 4. 41. The point group symmetries of a square and a rectangle respectively, are 1. 2. 3. 4. 42. 5/2 1/2 1 3/2 Identify the molecule whose rotational constant can not be determined by spectroscopic methods. 1. 2. 3. 4. 45. one two three four The magnitude of the nuclear spin angular momentum of a nuclei is 15 /2 units. The value of I is 1. 2. 3. 4. 44. D4h and D2h C4h and C2h D4h and C2h C4h and D2h The number of rotational degrees of freedom of CO2 is 1. 2. 3. 4. 43. C4v D4 h C2h C2v C H4 H2 C O2 HCl Which of the following transitions in the electronic spectrum of a homonuclear diatomic molecule is forbidden 1. u g 2. 3. 4. g u g g u u 46. The diffraction pattern of a cubic solid has an intense 110 Bragg reflection, but the 100 and 111 Bragg reflections are absent. The structure of the solid is 1. 2. 3. 4. 47. The logarithmic conductivity of a crystalline solid shows a linear variation with inverse temperature (1/T). The band gap may be obtained from 1. 2. 3. 4. 48. Body-centered cubic Primitive cubic Face-centered cubic Edge-centered cubic slope of the plot. intercept on the conductivity axis. intercept on the temperature axis. inverse slope The molar masses of monodisperse and polydisperse polymers obey respectively the conditions: ( M n = Number average molecular weight and M w = Weight average molecular weight). 1. 2. M n M w and Mn M w 3. M n M w and Mn M w 4. 49. M n M w and Mn M w M n M w and Mn M w Curding from milk, an enzyme-catalysed reaction, is most efficient around 1. 2. 3. 4. 50. 0 C and pH 10 0 C and pH 4 0 C and 4 pH 10 25 C and 4 pH 10 The spatial part of hydrogen molecular wavefunction in the simplest molecular orbital theory is given by 2 where g is normalized linear combination of two g hydrogen 1s orbitals. Which of the following is true about the above wavefunction? 1. 2. 3. 4. It contains only covalent terms. It includes only a small amount of ionic terms. It contains only ionic terms. It overestimates the ionic terms. 51. A 2pz orbital of hydrogen atom is an eigenfunction of 1. 2. 3. 4. 52. By a reversible process, we mean one that always 1. 2. 3. 4. 53. H only. H and L2 only H, L2 and Lz only H, L2, Lz and Lx takes infinite time for completion satisfies S (universe) = 0 satisfies G = 0. gives maximum work A hydrogenic 3p orbital has the following form of the radial wavefunction ( i = constant): 1. 2. 3. 4. 54. r ( 1 r )e 2 r r 2e 3 r r ( 4 r ) ( 5 r ) e 6 r r 3 e 7 r The wavefunction sin 1 x is not acceptable because it is 1. 2. 3. 4. 55. not continuous not differentiable not an eigenfunction of kinetic energy operator not a single-valued function IUPAC name for the compound given below is O 1. 2. 3. 4. 56. E-5-ethylhept-5-en-2-one Z-5-ethylhept-5-en-2-one E-3-ethylhept-2-en-6-one Z-3-ethylhept-2-en-6-one The most suitable reagent for the following transformation is O M eO M eO 1. 2. 3. 4. 57. Acetophenone can be converted to phenol by reaction with 1. 2. 3. 4. 58. m-CPBA followed by base catalysed hydrolysis conc. HNO3 iodine and NaOH singlet oxygen followed by base catalysed hydrolysis Reaction of phenyl benzoate with an excess of methylmagnesium bromide gives a mixture of 1. 2. 3. 4. 59. NaBH4 B2H6 Zn-Hg / HCl NH2NH2 / HCl triphenylmethanol and phenol 2-phenylpropan-2-ol and phenol acetophenone and toluene 2-phenylbenzoic acid and toluene The major product formed in the reaction of 2-methylbut-3-en-2-ol with HBr is Br 1. 2. Br 3. HO Br Br 4. O 60. Among dimethylcyclobutanes, which one can exhibit optical activity? 1. 2. 3. 4. 61. cis-1,2-dimethylcyclobutane trans-1,2-dimethylcyclobutane cis-1,3-dimethylcyclobutane trans-1,3-dimethylcyclobutane The monomer of biopolymer DNA is a 1. 2. 3. 4. nucleotide amino acid disaccharide fatty acid 62. The order of chemical shifts ( value) in the 1H NMR spectrum of crotonaldehyde is 1. 2. 3. 4. 63. Natural sugars and aminoacids are predominantly 1. 2. 3. 4. 64. olefinic > CHO > Me CHO > Me > olefinic CHO > olefinic > Me olefinic > Me > CHO D-sugars and L-amino acids D-sugars and D-amino acids L-sugars and D-amino acids L-sugars and L-amino acids The product formed in the reaction given below is Me h Me Me 1. Me Me 2. Me Me 3. Me Me 4. Me 65. The major product formed in the reaction given below is COOM e + Me Me 1. COOM e 2. COOM e Me 3. Me M e OOC Me COOM e 4. 66. The conversion of excited singlet state (S1) of a molecule to triplet state (T1) is known as 1. 2. 3. 4. 67. fluorescence phosphorescence intersystem crossing internal conversion The decreasing order of stability of the free radicals A, B and C is Me Me Me A 1. 2. 3. 4. A>B>C C>A>B B>A>C A>C>B Me H Me CH2 B Me H H Me H C 68. The major product formed in the reaction given below is H Na N3 O ?? H OH 1. N3 N3 2. OH OH 3. N3 OH 4. 69. N3 The rates of keto-enol tautomerism in the ketones A-C, given below, are in the order O A 1. 2. 3. 4. 70. O B O C A>B>C A>C>B C>A>B C>B>A The reaction given below is an example of COOEt COOEt COOEt 1. 2. 3. 4. Na OEt O aldol condensation Knoevenagel condensation Dieckmann condensation acyloin condensation PART C 71. The covalent radii vary gradually in the Periodic Table. From the orders given below for such radii, the correct ones are (a) Ce > Lu, (b) Co > Ti, (c) Sr > Ca, (d) I > Se 1. 2. 3. 4. 72. The first ionization energy for the elements Si, P, S and Cl, follows the order 1. 2. 3. 4. 73. (a) and (b) only (a) and (c) only (a), (c) and (d) only (b), (c) and (d) only Si<P<S<Cl Si<S<P<Cl S<Si<P<Cl S<Si<Cl<P The pair of gaseous molecules/ions having tetrahedral structure is + 1. 2. 3. 4. 74. SnCl4 , PH4 SeCl4, XeF4 + ICl4 , PH4 SnCl4, ICl4 - Consider the following Volumetric method for Ag(I) Indicator used (a). Fajan method Chromate (b). Mohr s method Fluorescein (c). Vohlard method ferric salt The method and indicator matches correctly in 1. (a) and (b) only 2. (b) and (c) only 3. (c) only 4. (b) only 75. An unknown lead solution has diffusion current of 1.0 A. To a 10 ml of this solution 0.5 ml of 0.04 M lead is added. The diffusion current of the spiked solution is 1.50 A. The concentration of the unknown lead solution is 1. 2. 3. 4. 76. 0.0020 M 0.0050 M 0.0035 M 0.0010 M The 32P radio isotope, used in leukemia therapy, has t1/2 = 14.26 days. What % of 32 P remains after 35 days ? 1. 30% 2. 8% 3. 81.7% 77. 4. 18.3% On a 30 cm column, the tR of A and B respectively are 16.40 and 17.63 minutes. The t0 of the column is 1.30 minutes. The peak width at base lines for A and B are 1.11 and 1.21 minutes respectively. The column resolution RS is 1. 2. 3. 4. 78. Which one of the following pairs of electronic configurations of high-spin transition metal ions (3d) in an octahedral field undergoes a substantial JahnTeller distortion: 1. 2. 3. 4. 79. Ce(IV), Ln(III) Ln(III), Eu(II) Ce(IV), Eu(II) Ln(III), Ce(III) Which one of the pairs of following statements about reduction of [CoCl(NH3)5]2+ by Cr(II) is correct: (A). (B). (C). (D). 1. 2. 3. 4. 81. d3, d9 d4, d9 d5, d9 d6, d9 Which one of the following pairs consists of a good oxidizing and a good reducing agent respectively: 1. 2. 3. 4. 80. 1.06 1.23 2.12 2.23 Reactant [CoCl(NH3)5]2+ has non-labile coordination sphere Reaction proceeds by outer-sphere mechanism Reactant [CoCl(NH3)5]2+ has labile coordination sphere Reaction proceeds by inner-sphere mechanism (A) and (B) (A) and (D) (C) and (B) (C) and (D) Hemocyanin contains 1. 2. 3. 4. a dinuclear copper core and binds dioxygen in the cuprous state. a dinuclear copper core and binds dioxygen in the cupric state. a mononuclear copper core and binds dioxygen in the cuprous state a mononuclear copper core and binds dioxygen in the cupric state. 82. The 31P NMR spectrum of PF4N(CH3)2 at room temperature and low temperature (173 K) respectively shows (assume that N and H do not couple): 1. 2. 3. 4. 83. The number of hyperfine lines in the EPR spectrum of a one electron reduced product of [Co3(CO)9Se] (I = 7/2 for Co nucleus) is: 1. 2. 3. 4. 84. 16 18 20 22 The number of bridging and terminal carbonyls present in Co4(CO)12 at low temperature are respectively: 1. 2. 3. 4. 87. 1 2 -1 -2 The maximum number of valence electrons of a metal in these complexes are: Mn2(C )10, ( 5-C5H5)Mo(CO)3Cl, ( 5-C5H5)2Ni, and ( 5-C5H5)2TiCl2 1. 2. 3. 4. 86. 8 15 22 1 The highest oxidation state of a metal in the following compounds is : ( 6-C6H6)2Cr, Mn(CO)5Cl, Na2[Fe(CO)4], K[Mn(CO)5] and K[Mo(CO)5Br] 1. 2. 3. 4. 85. triplet and quintet quintet and triplet quintet and triplet of triplets triplet and triplet of triplets 3 and 9 4 and 8 6 and 6 0 and 12 Olefin hydrogenation using Wilkinson s catalyst initiates with: 1. 2. 3. olefin addition to Rh(PPh3)2Cl olefin addition to Rh(PPh3)3Cl a phosphine dissociation from Rh(PPh3)3Cl 88. 4. a phosphine addition to Rh(PPh3)2Cl Although Fe(III) is a better Lewis acid compared to Zn(II), most hydrolytic enzymes contain Zn(II) at the active site because 1. 2. 3. 4. 89. Fe(III) is a redox active ion. Fe(III) has less abundance compared to Zn(II). Fe(III) generally makes octahedral complexes while Zn(II) makes tetrahedral complexes Zn(II) makes kinetically labile complexes. Considering the two complexes (A) [Ni(H2O)6]2+ and (B) [Ni(NH3)6]2+ , the right statement is 1. Complex (A) is diamagnetic and complex (B) is paramagnetic 2. Complex (A) is paramagnetic and complex (B) is diamagnetic 3. Both are paramagnetic 4. Both are diamagnetic 90. Unlike d-d transitions, the f-f transitions 1. do not change much with change in ligand 2. change significantly with change in ligand 3. appear at low energies i.e., at the near-IR region 4. appear as broad bands 91. The solvent that will enhance electrical conductivity of N2O4 considerably is 1. hexane 2. benzene 3. nitromethane 4. carbon tetrachloride 92. The major product obtained by the reaction of PCl5 with NH3, NH4Cl and (NH4)2SO4 respectively are 1. 2. 3. 4. 93. (PNCl2)n, P(NH2)4Cl and Cl3P=NPOCl2 P(NH2)4Cl, (PNCl2)n and Cl3P=NPOCl2 Cl3P=NPOCl2, (PNCl2)n and P(NH2)4Cl (PNCl2)n only Strongest superacid among the following is a 1. solution of HNO3 in H2SO4 2. solution of HClO4 in H2SO4 3. solution of SbF5 in HF 4. solution of SbCl5 in HCl 94. Consider the following statements regarding borazine, A. B. C. D. 1. 2. 3. 4. 95. It is isoelectronic with benzene Each nitrogen receives more -electron density from neighbouring boron than it gives away as a -donor It does not undergo addition reactions Nitrogen retains its basicity and boron its acidity. The true statements among the above are A, C and D A, B and D A and C only B, C, and D Which of the following has linear shape 1. H3C-N=C=S 2. H3Si-N=C=S 3. H3C-N=C=O 4. H3C-O-CH3 96. For a diffusion-controlled bimolecular reaction, the rate constant (kD) is proportional to (T = temperature; = coefficient of viscosity of medium). 1. T 1 2. T T 3. 4. 97. T Consider the unimolecular reaction A(g) products for which the following remarks were made. A. The reaction is second order at low pressure and becomes first order at high pressure. B. The reaction is first order at low pressure and becomes second order at high pressure. C. The reaction is zero order Which of these is correct? 1. A and B 98. 2. B and C 3. Only C 4. only A A random distribution of errors obeys the Gaussian form mean and standard deviation of this distribution obeys 1. 2. 3. 4. 99. it is not differentiable its first derivative is not continuous it does not cover the entire space it is not a single-valued function The following is true of 2px, 2py and 2pz orbitals of a H atom. 1. 2. 3. 4. 101. <x> = 0 and x = 1 / A <x> 0 and x = 1 / A <x> = 0 and x = A <x> = 0 and x = A The function sin-1 x is not an acceptable wave function because 1. 2. 3. 4. 100. A / exp[ Ax 2 ] . The All are eigen functions of Lz Only 2px and 2pz orbitals are eigen functions of Lz Only 2py orbital is an eigen function of Lz. Only 2pz orbital is an eigen function of Lz. Given two Hermitian operators A and B, we construct the following four additional operators AB, ABA, i[A,B], A2B. Choose the correct option from below. 1. 2. 3. 4. 102. All these 4 operators are Hermitian Only 3 of these operators are Hermitian Only 2 of these operators are Hermitian Only 1 of these operators is Hermitian The first-order correction to energy for the ground state of a particle-in-a-box due to a perturbation x would be 1. 2. 3. 4. L/2 L 2 L 2 103. Characters of a few symmetry operations are given below. Identify the character ' of the irreducible representation A2 g 1 2 3 4 104. E 1 1 1 1 Cn 1 1 -1 1 C2 1 -1 -1 -1 i -1 1 1 -1 h -1 1 1 1 The character of the irreducible representation A1 in C3v point group is given below A1 E 1 2C3 3 v 1 1 Identify one irreducible representation orthogonal to A1among the following. 1 2 3 105. 1 -1 -1 1 2 3 4 2 0 3 The rotational constant (B) of H35Cl, H37Cl and D35Cl follow the order 1. 2. 3. 4. 107. 3 v 1 0 -1 The energy levels of cyclopropene are + 2 , - , and - . The delocalization energy in C3H3- is 1. 2. 3. 4. 106. 2C3 -1 -1 0 4 1. 2. 3. 4. E 1 2 2 H35Cl > D35Cl H35Cl > H37Cl D35Cl > H35Cl H37Cl > H35Cl > H37Cl > D35Cl > H37Cl > D35Cl Observe the following statements I. II. III. Atomic mass of isotopes can be obtained from rotational spectra The separation between two successive rotational spectral lines of gaseons NO is 2B cm-1 The nmr spectrum of a compound gave a singlet at 300 Hz away from TMS using a nmr spectrometer operating at 60 MHz. Its chemical shif is 3 ppm. Which of the following is correct? 1. 2. 3. 4. 108. In a crystal, atom A is at the corners of the unit cell, B is at the centre of the cell and the oxygen atoms are at the face-centred positions. What is the formula per unit cell? 1. 2. 3. 4. 109. A8BO6 ABO6 A8BO3 ABO3 On mixing 100 mL of 0.1 M CH3COOH and 50 mL of 0.1 M NaOH, the pH of the solution will be 1. 2. 3. 4. 110. I, II and III are correct. Only III is correct. I and II are correct. Only I is correct. pka + 0.301 pka pka - 0.301 pka + 0.477 Using the fundamental equation dA= - SdT P dV, the Maxwell relation is 1. 2. 3. 4. S V P T S V S P V P T V T P V S S T S P V T T V 111. The relationship between mean ionic activity coefficient for Ca3(PO4)2 and its ions is given by 1. 2. 3. 4. 112. Assuming that C H and C X bond lengths in X the molar residual entropy at 0 K is 1. 2. 3. 4. 113. tr > rot > vib > ele rot > vib > tr > ele ele > vib > rot > tr vib > rot > tr > ele A A and B B interactions are stronger than A B A A and B B interactions are weaker than A B Both A A and B B interactions are equal to A B Either A A or B B interactions is equal to A B In the presence of external magnetic field the transition 3D1 1. 2. 3. 4. 116. 0 Rln2 Rln3 Rln6 A binary mixture of A2 and B2 will show negative deviation from Raoult s law when 1. 2. 3. 4. 115. X are nearly equal, The contributions to the molar entropy by translational (tr), rotational (rot), vibrational (vib) and electronic (ele) degrees of freedom is in order 1. 2. 3. 4. 114. = +3 -2 = +2 -3 5 = +3 -2 5 = +2 -3 3 P1 splits into 3 5 7 9 The term symbol for the ground state of rhodium (Rh, atomic number 45) is 4F. The electronic configuration for this term symbol is 1. 2. 3. 4. [Kr] 4d7 5s2 [Kr] 4d8 5s1 [Kr] 4d9 5s0 [Kr] 4d7 5s1 5p1 117. Ionic equivalent conductance value for Ca2+ is 0.0119 ( S m2 mol-1) and for Cl- is 0.0076 ( S m2 mol-1). The correct expected molar conductivity at infinite dilution for CaCl2 is 1. 2. 3. 4. 118. Find correct pair for ionic strengths of (a) a 0.02 molal solution of KCl and a 0.02 molal solution of K2SO4. 1. 2. 3. 4. 119. 0.0195 S m2 mol-1 0.0271 S m2 mol-1 0.0542 S m2 mol-1 0.01355 S m2 mol-1 (a) 0.020 mol Kg-1 (a) 0.020 mol Kg-1 (a) 0.020 mol Kg-1 (a) 0.020 mol Kg-1 The term symbol for the ground state configuration of NO is 1. 2 u 2. 2 g 3. 1 u 4. 120. 1 g The kinetic chain length ( ) is a measure of chain propagation. If the rates of consumption are denoted by Rc and rates of production by Rp; M and M denote the monomer and the active center, respectively. The correct definition of is 1. 2. 3. 4. 121. (b) 0.020 mol Kg-1 (b) 0.060 mol Kg-1 (b) 0.050 mol Kg-1 (b) 0.030 mol Kg-1 Rc (M) / Rp (M ) Rp (M ) / Rc (M) Rc (M ) / Rp (M) Rc (M) / Rc (M ) Amongst the following the correct statement for the compounds A, B, and C, is Br Cl H H Cl H C Cl Br A 1. 2. 3. B A and B are achiral and C is chiral A is chiral and B and C are achiral A and B are chiral and C is achiral C 4. 122. 4-tert-Butylcyclohexanone on reduction gives two isomeric alcohols which are 1. 2. 3. 4. 123. A is achiral and B and C are chiral Enantiomers Diasteromers Rotamers Homomers For the following compounds A and B the correct statement is 1. 2. 3. 4. A is aromatic and B is antiaromatic A is antiaromatic and B is non-aromatic A and B are both aromatic A and B are both non-aromatic 124. Identify the product formed in the following transformations 125. Identify the product formed in the following sequence of reactions 126. Identify the products A and B in the following reaction sequence 127. Match the following: A. Conversion of 1,7-octadiene to cyclohexene i) Wacker Oxidation B. Conversion of bromobenzene to ethyl cinnamate ii) McMurry Coupling C. Conversion of 1-hexene to 2-hexanone iii) Heck reaction iv) Olefin Metathesis 1, A: iv; B: ii; C: iii 2. A: ii; B: iv; C: i 3. A: iv; B: iii; C: i 4. A: i; B: iii; C: iv 128. Reagents that can be used in the following conversion are 1. 2. 3. 4. 129. i) Ph3P=CH2, ii) HCN, iii) H3O+ i) HS(CH2)2SH, ii) n-BuLi, iii) BrCH2COOH i) EtMgI, ii) KMnO4 i) Ph3P, CBr4, ii) n-BuLi, iii) CO2 The major product formed in the following reaction is O KOH O O 1. O CO O H H 2. OH O OH 3. OH 4. 130. In the following reaction, the structure of the major product is N O S H COOEt T HF 131. For the following reaction, the structure of the major product is 132. Identify the products A and B in the following reaction sequence. O O O O 1. A is B is I O O O O 2. A is B is I O O O O 3. A is B is I O O O O 4. A is B is I 133. Major product formed in the following reaction is T M SO CN 1 . M e M g Br 2. aq. NH4Cl 134. In the following reaction sequence the structure of the major products X and Y are O S i . n-BuLi O S X ii. CH3CH2CH2Br HgSO4, H2O Y 135. Product of Sharpless kinetic resolution of the following alcohol with (-)-diethyl tartrate is Me 1. OH Et Me O 2. OH Et Me OH 3. Et Me O 4. OH Et 136. Select the product of the reaction of (Z)-(2-methoxyvinyl)benzene with dichloroacetyl chloride in presence of triethyl amine. 137. Identify the product formed in the following reaction 1. HNO2 OH 2. hv ON 1. OH ON 2. OH 3. OH NO 4. 138. NO OH The compound formed in the following reaction sequence is 1. H2O2 / NaOH O 2. NH2NH2; KOH (CH2OH)2, 1. OH 2. O O 3. NH N H NHNH 2 4. O CHO 139. Cholestanol on oxidation with chromium trioxide in acetic acid/pyridine gives a dicarboxylic acid, which on pyrolysis in the presence of a catalytic amount of barium hydroxide gives compound A as the major product. The structure of A is H H HO H H ( ch o l e sta n o l ) H 1. O H H H O 2. H O H O 3. H H O H H H H H Et 4. H H Me H 140. Photolysis of 1,4-dimethyl-1,3-cyclohexadiene in presence of excess oxygen and catalytic amount of Rose Bengal followed by reduction with H2/Pt provides Me OH Me OH Me OH Me OH 1. 2. Me 3. HO O Me 4. O 141. Me In the following reaction sequence, the correct structures of the major products X and Y are OH OEt X Ph X is an d Y i s OE t O X is C CHO Ph Ph 2. CHO and Y is Ph Ph O 3. C X is and Y is CHO Ph Ph CHO O 4. X is a nd Y i s Ph 142. Y HgOAc OE t O 1. Ph Structure of the X and Y in the reaction sequence of thiophene given below are Br2, a q HBr, -5 oC piperidine X S Y 1. X is 2. X is S Br S Br and Y is N and Y is Br X is 3. S Br Br X is 4. and Y is S 143. Br S N and Y is S N S N S Identify the product of hydrogenation (H2, Pd/C) of the protected amino acid given below OCOP h Cb z-HN 144. COOCH2P h In the broad band decoupled 13C NMR spectrum, the number of signals appear for (a) catechol, (b) resorcinol and (c) hydroquinone, respectively, are 1. 2. 3. 4. six, four and two six, six and four three, four and four three, four and two 145. In the proton NMR spectrum, an organic compound exhibited the following spectral data 7.2 (1H, dd, J = 8 and 1.5 Hz), 6.8 (1H, d, J = 1.5 Hz), 6.7 (1H, d, J = 8 Hz), 4.9 (2H, s), 3.9 (3H, s), 3.85 (3H, s), 3.5 (1H, br s, exchangeable with D2O) The compound among the choices given below is OM e OH 1. OM e HO OM e 2. OM e M eO OH 3. OM e OH 4. M eO OM e

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Additional Info : CSIR UGC (National Eligibility Test) NET New Exam Scheme June 2011 Model Question Paper - Chemical Sciences Joint CSIR UGC NET Exam Question Papers
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