38. Which one of the following complexes is high spin?
(A)
(B)
(C)
(D)
(E) None of above

39. A wide variety of ligands can kinetically stabilize ions that would normally be potent oxidizing agents. Which of the following statements is NOT correct for an example of Co(III)- Co(Il) couple? (A) Co(IIIl) is kinetically stable when coordinated with any ligand other than water of fluoride. (B) The hydrated is a very strong oxidizing agent, reacting readily with water to form H2 and Co(II). (C) The oxidation of a Co(Il) complex to a Co(IIl) complex generally results in a change from the high-spin Co(II) to the low-spin Co(IIl) accompanied by a significant increase in LFSE with almost any ligand. (D) The case in ( C ) often contributes to the stability of many Co(IIl) complexes, rending many of them weaker oxidizing agents than expected. (E) None of above.

40. Which one of the following complexes is labile? (A) (B) (C) (D)(E)

41.Predict the numbers of C-O and C-N stretches in cis-. (A)2,3 (B)2,4(C)1,3 (D)2,1 (E) 2,2

42. The NO (nitrosy1) ligand shares many similarities with CO. Which of the following statements is NOT correct? (A) Like CO, it's a o donor and π acceptor and can serve as terminal or bridging ligand. (B) NO has two common coordination modes； linear and bent. (C) Linear NO is counted as a 2-electron donor, same as CO. (D) has been used as a vasodilator for the treatment of high blood pressure. (E) Cr(NO)4 is tetrahedral molecule.

43. All five complexes followed 18E rule. Which one has the largest ? (A) (B) (C) Cr(CO)6 (D) (E)

44. What is the bond order in complexes Cp2Mo2(CO)4? (A)1 (B)1.5 (C)2 (D) 2.5(E)3

45. How many bridging u-CO in ? (A)0(B)1 (C)2 (D)3 (E) 4

46. The reaction of Re(CO)5Br with the ion BrCH2CH2O- gave compound Y and Br-. Which one the following statement is NOT correct. (A) The most likely site of attack of this ion is Re metal. (B) Y obeys 18e rule. (C) No gas is evolved in the reaction. (D) Addition of solution of Ag+ to a solution of Y gave a white ppt. (E) NMR indicates the there are five distinct magnetic environments for carbon in Y.

47. Upon heating, the complex (CO)3Mn(PPh3)2(13COMe) lost a gas, what is the gas? (A) (B) (C)and (D)(E) None of above

48. What is Wilkinson's catalyst? (A) HRh(CO)2(PPh3)2 (B)(C) cis-IrCl(CO)(PPh3)2 (D) trans-IrCI(CO)(PPh3)2 (E) RhCI(PPh3)3

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