12. Which of the following dinuclear complexes is regarded as having a quadruple bond?
(A) Re₂(CO)₁₀
(B) Fe₂(CO)₉
(C) Mn₂(CO)₁₀
(D) [Re₂Cl₁₀]^2-
(E) Co₂(CO)₈

1. Which metal is naturally found in its elemental state? (A) gold (B) titanium (C) chromium (D) iron (E) zinc

2. Which complex ion is diamagnetic? (A) [Fe(H2O)6]3+ (B) [Fe(H2O)6]2+ (C) [Co(NH3)6]3+ (D) [CoCl6]3- (E) [Cr(H2O)4Cl2]+

3. Which orbital gives an electron a greater probability of being found closer to the nucleus? (A) 3s (B) 2s (C) 3f (D) 3p (E) 3d

4. The metallic radii in the third row of the d block are very similar to those in the second row, and not significantly larger as might be expected given their considerably larger numbers of electrons. We name this as (A) shielding effect (B) inert-pair effect (C) penetration (D) lanthanide contraction (E) catenation

5. The metal coordinated by porphyrin ligand called a heme is connected to a protein. Which of the following proteins is not a O2/[O] transport and storage proteins? (A) myoglobin (B) hemoglobin (C) hemocyanin (D) ferritin (E) cytochrome P-450

6. The Fe=O oxidizing center in cytochrome P-450 is characterized as an Fe(IV) complex with the porphyrin also oxidized by one electron. Which of the following statement is      incorrect     ? (A) The complex has a magnetic susceptibility that indicates the presence of two unpaired electrons (B) The iron ion is in a triplet state (S = 1) (C) The Fe(IV) oxidation state corresponds to t2g4 with two unpaired electrons (D) The oxidation of the porphyrin ring removes one electron from the π HOMO (E) Cytochrome P-450 is the enzyme with iron porphyrin active site that catalyzes the addition of oxygen to a substrate

7. The Monsanto process, a highly successful commercial process, is based on the metal-catalyzed carbonylation of methanol. This metal-containing catalyst is: (A) [Rh(CO)(PPh3)3] (B) [RhI2(CO)2]- (C) [RhCl(PPh3)3] (D) [CoH(CO)4] (E) [CoH(CO)3]

8. A good way to picture the incorporation of hetero atoms into a metal cluster is to use isolobal analogies. Which of the following fragments is the isolobal analogy of [Mn(CO)5]+? (A) [Co(CO)3] (B) [Fe(CO)4] (C) [Co(CO)4] (D) [HFe(CO)5] (E) [NH2]

9. Which of the following statement is      incorrect     ? (A) For the Schrock carbene, the pz orbital of CR2 is higher in energy than the dp orbitals of metal (B) For the Schrock carbene, the carbene C is nucleophilic (C) For the Schrock carbene, the M=C bond is polarized so as to put negative charge on the metal-bound C atom (D) In the Fischer carbene, the π-electron density is largely concentrated on the metal atom (E) Fischer carbenes are attacked at the C atom by nucleophiles

10. Which of the following complexes displays one very strong IR absorption band at 1889 cm-1 and two other very weak bands in the CO stretching region? (A) Co(CO)4 (B) cis-[Cr(CO)4(PPh3)2] (C) trans-[Cr(CO)4(PPh3)2] (D) Fe(CO)5 (E) Ni(CO)4

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