2.AIPMT question paper 2010 mains - AIPMT 2013

43. Among the elements Ca, Mg, P and Cl, theorder------Ans:Cl < P < Mg < CaSol: Covalent radii of Ca = 1.74 A°Mg = 1.36 A°P = 1.10 A°Cl = 0.99 A°49. The IUPAC name of the compound--------Ans:pent – 3 – en – 1 - yneSol: 5 4 3 2 1CH 3 − CH = CH − C ≡ CH :pent – 3 – en – 1 - yne50. When glycerol is treated with excess of HI--------44. Which one of the following complexes is notexpected-----------Ans: [Ni (NH 3) 2 Cl 2]Ans:Sol:2 - iodopropaneGlycerol when treated with excess of HΙgives 2- iodopropane.Sol:[Ni (NH 3) 2 Cl 2] is a tetrahedral complex.45. Which one of the following compounds will bemost --------Ans: CH 3COCH 2CH(OH)CH 2CH 3Sol:It is a β-hydroxy ketone. β-hydroxyaldehydes and ketones readily undergodehydration.46. Among the following four compounds--------Ans:Sol:d > c > a > bOrder of acidity isp-nitrophenol > m-nitrophenol > phenol >methyl phenolPresence of electron withdrawing groupsincreases acidity of phenols and electrondonating group decreases the acidity ofphenols.47. Fructose reduces Tollen’s reagent due to--------Ans: enolisation of fructose followed byconversion to aldehyde by baseSol:Fructose is a ketose. In presence of baseit undergoes rearrangement to form anequilibrium mixture containing glucose,fructose and mannose.48. Which of the following conformers for ethyleneglycol is--------51. Which of the following species is not electrophilic--------Ans: H 3O +Sol:H 3O + is not electrophilic.52. In the following reactionC 6H 5CH 2Br--------Ans: C 6H 5CH 3Mg / etherSol: C 6H 5CH 2Br ⎯⎯⎯⎯⎯→ C 6H 5CH 2MgBrH⎯O 3⎯ → C6H 5CH 3⎯ +53. In which of the following molecules the centralatom--------Ans: SF 4Sol:Central atom in SF 4 is sp 3 d hybridized.54. The rate of the reaction 2NO + Cl 2 -> 2NOCl isgiven by--------Ans:Sol:Increasing the temperatureRate constant depend on temperature butnot on concentration.55. Match List-I (Equations) with List-II (type ofprocesses)--------Ans: (iv) (i) (ii) (iii)Sol:Where K p > Q reaction is spontaneous∆G = ∆G° + RTlnQ∆G = ∆H − T∆SAns:Sol:Gauche confirmation of ethylene glycol.The gauche conformation of ethyleneglycol is more stable due to intramolecularhydrogen bond formation.56. Match List-I (substances) with List-II (pocesses)employed in the manufacture of the --------Ans: (iv) (ii) (iii) (i)Sol:Sulphuric acid - contact process