22. The compound that can undergo oxidative addition reaction with Cla is:
(A) [(η⁵-C₅H₅)₂Fe],
(B) [Mn(CO)₅]^- ,
(C) PtCl₄,
(D) [(η⁵-C₅H₅)Mo(CO)3]^-, or
(E) [Ir(CO)CI(PPh₃)₂].

23. What are the states (with J values) of 'D term? (A) 3D3,3D2,3D1. (B) 3D2,3D3,3D4. (C) 3P1, 3P2,3P3. (D)3P2, 3P3,3P4. (E) 3F2,3F3, 3F4.

24. Which of the following is labile? (A)[(η5-C5H5)2Ru],(B) [Mn(CN6)]3-,(C)[V(H2O)6]2+,(D)[CoF6]3-,or (E)[Pt(CN)4]2-

25. [Cu(H2O)6]2+has2D ground state term that splits into two energy levels, the state with lower energy is? (A) 2A1g,(B) 3T1, (C)3B1, (D) 2Eg, or (E) 2T2g

26. For the hexaaqua complexes of Mn(II), Fe(II), Co(Il), Ni(II), Cu(ll), and Zn(II), How many of them are expected to exhibit geometric distortions based on Jahn-Teller Theorem? (A) 0,(B) 1, (C) 2, (D) 3, or (E) 4.

27. The following statements are given regarding the complex [Ru(PPh3)3CI2] showing an agostic Ru-H-C interaction (structure shown on the right).I. This complex is an 1 8-electron species.ll. The 1H NMR shift of Ru-H-C shows in upfield region as compared to other protons.Ⅲ. The agostic C-H bonds shows vcH that shifts to lower wavenum ber as compared to other C-H bonds. IV. Increased acidity observed for the agostic C-H proton. How many of these statements are true:(A) 0, (B) 1, (C) 2, (D) 3, or (E) 4

複選題28. Exchange of an H2O ligand on [(CO)3Mn(H2O)3]+is much more rapid than on [(CO)3Re(H2O)3]+. The activation volume for the Mn case is -4.5 ± 0.4 cm3mol-1. The Mn complex has infrared bands at 2051and 1944 cm-1 that can be attributed to C-O stretching vibrations. Which of the following are correct? (A) First row transition metal complexes are generally more substitutionally labile, thus more "weak-field" than second and third row complexes. (B) The negative volume of activation is consistent with a D (or Id) mechanism. (C) Occurrence of two infrared bands of [(CO)3Mn(H2O)3]+ is more consistent with a fac isomer. (D) mer-[(CO)3Mn(H2O)3+ is isostructural with mer-[(CO)3Re(H2O)3]+. (E) The C-O stretching vibrations observed in [(CO)3Mn(H2O)3]+should have higher vibrational frequencies as compared to free CO.

複選題29. Two well-known complex ions containing Ni are [Ni(H2O)6]2+, which is green, and [Ni(en)3]2+ (en = ethylenediamine), which is purple. Which of these statements are true? (A) The green complex absorbs green light. (B) The reaction of [Ni(H2O)6]2+with excess of en should afford [Ni(en)3]2+. (C) Both complex ions are paramagnetic. (D) Both complex ions are 18-electron species. (E) The crystal field splitting energy is smaller for [Ni(en)3]2+ than for [Ni(H2O)6]2+

複選題30. A complex of dihydrogen, such as [Ir(PiPr3)2Cl3(H2)], is a metal compound with H2 as ligands. Which of the following statements are correct for this dihydrogen complex? (A) H2 is a σ-donor. (B) The H-H bond length of [Ir(PiPr3)2CI3.(H2)] is longer than that of molecular dihydrogen. (C) This complex is an 18-electron species. (D) The formal oxidation state of Ir should be +3. (E) Hz molecule of [Ir(PiPr3)2Cl3(H2)] forms π-bonding interaction with the Ir.

複選題31. Consider the two structures A and B, which of the following statements are correct? (A) A is a Fischer Carbene and B is a Schrock Alkylidene. (B) The carbene ligand in A should be described as a dianionic, 4- electron donor, and the carbene ligand in B should be described as a neutral, 2-electron donor. (C) A can be prepared via a-H elimination. (D) A tends to react with a nucleophile. (E) B could react with BF3 to yield a carbide product.

複選題32. For the reaction show below, which of the following statements are correct? Ni0L4+ CO⇌Ni0L3CO + L (A) The forward reaction is likely to go by the Dissociative ( D ) mechanism. (B) The forward reaction should possess a large positive and a large negative . (C) To obtain the △G for the reaction, you can measure rates of forward reaction at different temperatures to determine rate constants, and plot In k vs. I/T. (D) PPh3 would yield the largest value of Keq and △G for the reaction as compared to PMe3 and P(OEt)3. This statement should be attributed to the electronic argument. (E) The presence of higher concentration of CO should shift the equilibrium to the right.

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