CHEMISTRY 31. H H OH H OH H OH H OCH 3 OCH 3 A & B are HIO 4 A B ( 2H2O) (A) HCHO & HCOCH(OCH3)2 (C) (CH3O)2C = O and COOH COOH (B) (CH3O)2CH COOH & HCHO (D) HCOOH & HCOCH(OCH3)2 32. In vulcanization of rubber we add (A) Sulphur (B) Phosphorus (C) Magnesium (D) Chlorine 33. Natural rubber is a polymer of (A) Chloroprene (B) Isoprene (C) 1, 3-Butadiene (D) None Ans - B 34. Nylon-6 is a polyamide having monomer (A) Caprolactam (B) Cyclohexane (C) Cyclohexanone-oxime (D) None 35. The reagent used for detection of protein is (A) Conc. HNO 3 (C) Tollen's reagent (B) Fehling's solution (D) Baeyer's reagent Paragraph for Questions Nos. 36,37 & 38 In the following reaction sequence, product I, J and L and formed. K represents a reagent. 1. Mg/ether 1. NaBH Hex 3 ynal 4 K I 2. CO 2. PBr 2 J 3 3. H 3 O + 1
36. The structure of the product I is (A) (B) Ans (C) (D) 37. The structures of compound J and K, respectively, are (A) (B) Ans (C) (D) 2
38. The structure of product L is (A) (B) Ans (C) (D) 39. Phenol is less acidic than (A) ethanol (B) methanol (C) o-nitrophenol (D) p-cresol. Ans Nitro is electron withdrawing group (C) 40. Schiff s reagent is (A) magenta solution decolourised with sulphurous acid (B) magenta solution decolourised with chlorine (C) ammonical manganese sulphate solution (D) ammonical manganese chloride solution Ans (A) Schiff s reagent is the colourless solution obtained by passing SO2 gas in pink solution of magenta dye (rosanaline hydrochloride). A 41. ncf 2 = CF 2 heat, high pressure ( CF 2 CF 2 ) n Teflon, A is: Ans C (A) Pt-catalyst (B) (NH 4 ) 2 Cr 2 O 7 (C) (NH 4 ) 2 S 2 O 8 (D) Adipic acid 3
42. In the reaction CH3 CH = CH CHO agent oxidi sin g CH3 CH = CH COOH, the oxidising agent can be (A) alkaline KMnO4 (C) Benedict s solution (B) acidified K2Cr2O7 (D) all of the above Ans (C) Benedict solution (solution of CuSO4, sodium carbonate and sodium citrate) is specific for oxidation of aldehydes. 43. (A) H2N CH2CH2 NH2, CH3CHO (C) H2N CH2CH2 NH2, CHO CHO Ans A (B) CH3CHO, NH2 NH2 (D) HCHO, CH3NH2 44. For the reaction R Br R O N = O the suitable reagent is (A) NaNO2 + HCl (B) HNO2 (C) AgNO2 (D) KNO2 Ans (D) Alkyl nitrites are prepared by the action of alkyl halide and potassium nitrite only but in case of silver nitrite the main product is nitro alkane although a small amount of alkyl nitrite is also formed. R Br + KNO2 R O N = O + KBr 45. The following method cannot be considered suitable for the preparation of alkyl halide: (A) Halogenation of alkane (C) ROH and HX (B) ROH and PX3 (D) Alkene and HX Ans 4
46. What is A is the following reaction 4 Et2CO + NaCN + NH4Cl NH OH A (B) C 2 H 5 CH NH 2 CN Ans A (C) C 2 H 5 CH NH 2 COOH (D) No reaction takes place 47. Which of the following is an example of basic dye? Ans - (A) Alizarine (B) Indigo (C) Malachite (D) Orange I 48. The compound which reacts fastest with Lucas reagent at room temperature is (a) butan-1-ol (c) 2-methylpropan-1-ol (b) butan-2-ol (d) 2-methylpropan-2-ol Ans - D 5
49. Chlorination of toluene in the presence of light and heat followed by treatment with aqueous NaOH gives Ans - D (a) o-cresol (b) p-cresol (c) 2, 4-dihydroxytoluene (d) benzoic acid 50. When phenol is treated with excess bromine water, it gives (a) m-bromophenol (c) 2, 4-dibromophenol (b) o- and p-bromophenol (d) 2, 4, 6-tribromophenol Ans - D 51. The increasing order of boiling points of the below mentioned alcohols is (I) 1, 2-dihydroxy benzene (II) 1, 3-dihydroxy benzene (III) 1, 4-dihydroxy benzene (IV) hydroxyl benzene (a) I < II < IV < III (c) IV < II < I < III (b) I < II < III < IV (d) IV < I < II < III Ans - C 52. The reaction products of C 6 H 5 OCH 3 + HI is (a) C 6 H 5 OH + CH 3 I (c) C 6 H 5 CH 3 + HOI (b) C 6 H 5 I + CH 3 OH (d) C 6 H 6 + CH 3 OH For Questions 53 & 54 read the following passage: An alcohol A, when heated with concentrated H 2 SO 4 gives an alkene B. When B is bubbled through bromine water and the product obtained is dehydrohalogenated with excess of sodamide, a new compound C is obtained. The compound C gives D when treated with warm dilute H 2 SO 4 in presence of HgSO 4. D can also be obtained either by oxidizing A with KMnO 4 or from acetic acid through its calcium salt. 6
53. Compound B is: (A) ethene (B) propene (C) butene (D) but-2-ene 54. Compound D is: (A) Acetone (B) Acetaldehyde (C) Propanaldehyde (D) Ethyl alcohol Ans - B 55. 3, 3-Dimethylbutan-2-ol loses a molecule of water in the presence of concentrated sulphuric acid to give X as a major product. X is (A) 1,2 Dimethylbut-2-ene (C) 2,2 Dimethylbutene (B) 2,3 Dimethylbut-2-ene (D) 1,2 Dimethylbutene Ans - C None of the options are correct. Major product is 2,3 Dimethylbut-2-ene due to methyl shift. 56. How many structure of F are possible? (a) 2 (b) 5 (c) 6 (d) 3 Ans - D 7
57. pk a of CH 3 COOH, CCl 3 COOH, PhOH and PhSO 3 H are 4.79, 3.9,10.0 and 2.6. Arrange their conjugate bases in increasing leaving tendency. (A)PhO < CH 3 COO < CCl 3 COO < PhSO 3 (B)CCl 3 COO < PhSO 3 < PhO < CH 3 COO (C)CCl 3 COO < PhO < PhSO 3 < CH 3 COO (D)CH 3 COO < PhO < CCl 3 COO < PhSO 3 58. Which one of the following compounds most readily undergoes substitution SN2 mechanism? Ans - B 59. How many of the following statement(s) is/are correct? (i) The C Cl bond in chlorobenzene is shorter than in chloromethane (ii) The C Cl bond in chlorobenzene has some double bond character (iii) It is difficult to replace chlorine from chlorobenzene than from benzyl chloride (iv) Chlorobenzene on futher chlorination gives m dichlorobenzne (A) 3 (B) 1 (C) 2 (D) All 60. 2, 2 Dichloro 3 methyl butane on hydrolysis forms (A) Diethyl Ketone (C) 3 methyl butane 2, 3 diol Ans - B (B) methyl isopropyl ketone (D) 2 methyl butane 2, 3 diol 8