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.

複選題33. Which of the following techniques could provide electronic information of a metal complex? (A) UV-vis spectroscopy (B) IR spectroscopy (C) Cyclic Voltammetry (D) Mass spectrometry (E) EPR spectroscopy 

複選題34. About the atom, which descriptions are correct? (A) J. J. Thomson asserted the plum budding model for the atomic structure. (B) J. J. Thomson concluded the charge of an electron in his cathode-ray experiment. (C) In Robert A. Millikan's oil drop experiment, the ratio of charge/mass for an electron is -1.76 x 108 C/g. (D) By Ernest Rutherford, the concept of the atomic structure formed with the dense nucleus and the loose electron cloud was demonstrated. (E) The Bohr hydrogen atomic structure is a model based on quantum mechanics.

複選題35. In the Bohr's model of the hydrogen atom, please find the correct explanations. (A) Only the Lyman series in the emission spectrum of hydrogen fits the range of visible light. (B) The electron moves in a circular path around the nucleus. (C) The energy of the electron can take on only certain quantized values. (D) The only allowed orbitals are those in which the angular momentum of the electron is an integer multiple of h/2π. (E) The electron can only absorb or emit electromagnetic radiation when it moves from one orbital to another.

複選題36. Louis de Broglie's postulation that a particle has wave-like properties, together with Heisenberg's uncertainty principle, successfully rectified the major flaw in the Bohr-Sommerfeld model. (quantized energy states, and, electrons orbit around nucleus with well-defined values of momentum and position). However, it could not provide quantitative description of objects. Erwin Schridinger developed the wave equation to mathematically describe the energy and position of the clectron in space and time, taking into account the matter wave nature of the electron inside an atom. What are correct in the descriptions below? (A) The de Brogie wavelength is λ = Ib/p where h is the Planck constant and p is the momentum. (B) The Schrodinger waveftunction includes two parts which are about the kinetic energy and the potential energy of an electron. (C) The wavefunction of an electron in an atom contains radial and angular distribution functions. (D) When the radial distribution function R(r) is zero, it means the radial nodes (nodal surfaces) take place over "I", where "I'' is the angular momentum. (E) The Hund's rule mentions the spin multiplicity, the number of unpaired electron plus one, 2n(1/2)+1.

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