15. What is the formal oxidation state of iron in ferrocene (Fe(C₅H₅)₂) commonly used as a standard in electrochemistry?
(A) 0
(B)+1
(C) +2
(D) +3
(E) -1

16. Which of the following compounds shows Jahn-Teller distortion? (A) (B) (C) (D) (E)

17. Which structure is typical of a body-centered cubic (bcc) arrangement? (A) Atoms at the edges only (B) Atoms at the face centers only (C) Atoms at the corners and in the center of the unit cell (D) Atoms at both the corners and face centers of the unit cell (E) Atoms only at the corners of the unit cell

18. How many coordination numbers does each atom have in a close-packed structure? (A) 6 (B) 8 (C) 10 (D) 12 (E) 14

19. Please identify how many isomers of the following complexes: (a); (b) . (A)2;2 (B) 2;3 (C) 3;3 (D) 2;4 (E) none of the above

20. Which ion is most kinetically inert? (A) (B) (C) (D) (E)

複選題21. Metal in contains two unpaired electrons. Please identify all the possible first-row transition metal(s). (A) (B)(C) (D) (E)

複選題22. Which ion results in a strong Jahn-Teller effect? (A) d² (B) Low spin d4 (C) High spin d⁴ (D) d9 (E) d¹

複選題23. Which of the following statements are correct regarding the magnetochemical series and its role in predicting magnetic behavior in transition metal complexes? (A). The magnetochemical series ranks ligands by their magnetic influence on metal ions, which can help predict high-spin or low-spin states in transition metal complexes. (B) Ligands higher in the magnetochemical series always produce stronger ligand fields, which leads to high-spin states. (C) The magnetochemical series is primarily used to determine electronic transitions in metal-ligand complexes. (D) Strong-field ligands in the magnetochemical series tend to produce low-spin complexes with smaller magnetic moments. (E) The magnetochemical series does not apply to determining spin states in metal-ligand complexes.

複選題24. Which of the following statements about ligand binding and reactivity in organometallic complexes are CORRECT? Select all that apply. (A) Strong -acceptor ligands, such as CO, stabilize low-valent metal centers by withdrawing electron density from the metal. (B) Ligand exchange in organometallic complexes often depends on the relative binding affinities of incoming and outgoing ligands. (C) In the migratory insertion of CO into a metal-alkyl bond, the metal-carbon bond is formally cleaved during the reaction. (D) Chelating ligands enhance the thermodynamic stability of a metal complex by increasing the chelate effect. (E) ẞ-Hydride elimination requires a vacant coordination site on the metal to accommodate the hydride.

複選題25. Which of the following statements accurately describe aspects of Tanabe-Sugano diagrams for octahedral transition metal complexes? (A) They plot the energy of electronic states relative to the Racah parameter B (B) They apply only to high-spin d-electron configurations. (C) They can illustrate spin-allowed and spin-forbidden transitions. (D) They are primarily used for predicting magnetic moments. (E) They provide information on ligand field splitting as a function of the ligand strength. 

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