39. Which ion is mostly kinetically labile?
(A)
(B)
(C)
(D)
(E)

40. The reactions of (aq) ion with en (en = ethylenediamine) feature the equilibrium constants K shown below:Why is the K3 significantly smaller than K1 and K2? (A) Jahn-Teller effect (B) Trans effect (C) Cotton effect (D) Hard-Soft Acid-Base Principle (E) 18-electron rule

41. For anion, which of the following statements is correct? (A) This species should be paramagnetic. (B) There is a metal-metal quintuple bond present in this species. (C) This ion adopts a staggered conformation. (D) The electron count for each Os is 18. (E) The oxidation state for Os is +4.

42. Me2CHMgBr reacts with Ir(I)CIL3 to give Ir(I)HL3. How many of following statement(s) is/are correct? (i) The reaction also produces propene as a by-product. (ii) The possible intermediate is Ir(CHMe2)L3.(iii) β-H elimination likely involves in this process. (iv) The reaction of Me2CHMgBr with IrClL3 likely proceeds through associative mechanism. (A)0(B) 1 (C) 2(D) 3 (E) 4

43. The reactions of with NHs (reaction I) and of with [NO2]- (reaction II) followed by NH3 are ways of preparing: (A) I: trans-[PtCl2(NH3)2]； II: trans-(PtCl2(NH3)(NO2)]- (B)I: cis-[PtCl2(NH3)2]；II: trans-(PtCl2(NH3)(NO2)]- (C) I: cis-[PtCl2(NH3)2]； II: cis-[PtCl2(NH3)(NO2)]- (D) I: trans-[PtCl2(NH3)2]； II: cis-PtCl2(NH3)(NO2)] -

44. The kinetics of the isomerization of cis to trans-[Mo(CO)4(PEt3)2] can be followed by IR spectroscopy. Which of the following regions of the IR spectrum would you focus on to monitor the reaction? (A)800-1000   (B) 1400-1600 (C) 1800-2000  (D) 2400-2600   (E) 3000-3500  

45. Which experimental technique operates on the slowest timescale? (A) NMR spectroscopy (B) UV-vis spectroscopy (C) IR spectroscopy (D) Raman spectroscopy (E) Photonelectron spectroscopy

46. Which of the following complex has a highest oxidation state of metal? (A)(η6-C6H6)2Cr (B) Na2(Fe(CO)4] (C) Mn(CO)5Cl (D) Na[(η5-C5H5)Fe(CO)2] (E) Ni(CO)4

47. Ifcomplex [W(Cp)2(CO)2] follows 18e- rule. What is Hapticity of Cp? (A) 5 and 5 (B) 3 and 5 (C) 3 and 3 (D) 1 and 5 (E) 1 and 3

48. Which of the following is mostly stable? (A) [AuF2]- (B) [AuCl2]- (C) [AuBr2]- (D) [Aul2]-(E) [Au(CN)2]-

49. The intense red of an (shown below) solution is replaced by pale blue when cerium(IV) sulfate is added to it. Which of the following statements about this observation is correct? (A) The intense coloration o is due to inter-ligand charge transfer. (B) The electron count of is 20. (C) Addition of cerium(IV) sulfate causes the reduction of (D) The change of coloration upon the addition of cerium(IV) sulfate is due to lack of ligand to metal charge transfer transtions. (E) None of statements are correct.

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