Organometallic compounds: synthesis, bonding and reactions including oxidative addition and reductive elimination - One Line Questions

1. What is the formal oxidation state of iron in ferrocene? — +2
2. A ligand with hapticity η5 indicates that it is bonded to the metal through how many of its atoms? — 5
3. The 18-electron rule is a guideline used to predict the stability of organometallic complexes. It states that stable complexes typically have: — 18 valence electrons
4. In the context of organometallic reactions, what is a 'migratory insertion' reaction? — A ligand inserting into a metal-ligand bond
5. What is the 'ligand substitution' reaction in organometallic chemistry? — One ligand replacing another ligand on the metal center
6. The reactivity of organometallic compounds is largely due to the polarity of the metal-carbon bond and the ability of the metal to: — Undergo redox reactions
7. Which of the following is a common starting material for the synthesis of many organometallic compounds via direct reaction with metals? — Alkyl halides
8. Which of the following is a crucial reaction in many organometallic catalytic processes, involving the formation of a new M-C bond? — Oxidative addition
9. Which of the following is NOT a typical ligand in organometallic chemistry? — H2O (water)
10. In oxidative addition, the oxidation state of the metal center typically: — Increases by 2
11. Which of the following is a common method for synthesizing organometallic compounds? — Direct reaction of metal with organic halide
12. Which type of organometallic compound typically exhibits high thermal stability and is used in material science? — Organosilanes
13. The carbonylation reaction, often catalyzed by organometallic complexes, involves the insertion of what molecule? — CO
14. Which of the following is a potential hazard associated with certain organometallic compounds? — High volatility and flammability
15. Reductive elimination typically involves the formation of a new bond between two ligands previously bound to the metal center. This process: — Decreases the metal's oxidation state
16. Which factor generally increases the polarity of the metal-carbon bond in organometallic compounds? — Increasing the electronegativity of the metal
17. What type of bonding is predominantly observed between the metal and carbon atoms in organometallic compounds? — Polar covalent bonding
18. The synthesis of Wacker process catalysts, used for olefin oxidation, involves organometallic complexes of which metal? — Palladium
19. The synthesis of ferrocene typically involves the reaction of cyclopentadienyl anion with which metal compound? — Iron(II) chloride
20. Organometallic compounds containing alkali metals (e.g., R-Li) are generally: — More reactive and more ionic
21. Which element is typically NOT considered to form organometallic compounds? — Noble gases
22. Organolithium compounds (R-Li) are generally more reactive than Grignard reagents (R-MgX). What is the primary reason for this difference in reactivity? — The Li-C bond is more ionic than the Mg-C bond
23. The synthesis of Ziegler-Natta catalysts, used in polymerization, involves organometallic compounds of which metals? — Transition metals like Ti and V, and organoaluminum compounds
24. Which of the following reactions is characteristic of organometallic complexes, particularly in catalytic cycles? — Oxidative addition
25. In catalytic cycles, oxidative addition and reductive elimination are often: — Opposite steps
26. Wilkinson's catalyst, RhCl(PPh3)3, is primarily used for: — Hydrogenation reactions
27. The synthesis of dimethylgold(III) chloride from gold(III) chloride and methylmagnesium chloride is an example of: — Transmetallation
28. What is the term used to describe the removal of two groups from a metal center, decreasing its coordination number and oxidation state? — Reductive elimination
29. Consider the reaction: LnM(X)(Y)(R) -> LnM-R' + X-Y. This reaction is an example of: — Reductive elimination
30. Which of the following is a characteristic feature of organometallic compounds? — Presence of a metal-carbon bond
31. Grignard reagents are a class of organometallic compounds with the general formula R-Mg-X. What type of bond is present between Mg and R? —
32. Consider the reaction: LnM(CO)(R) -> LnM(COR). This is an example of: — Migratory insertion
33. The C-H activation reaction, a key step in some catalytic cycles, involves the breaking of a C-H bond and formation of metal-carbon and metal-hydrogen bonds. This is often a form of: — Oxidative addition
34. In the Wacker process, a key step involves the conversion of an alkene to an aldehyde or ketone. This transformation is facilitated by organopalladium intermediates, which undergo reactions like: — Migratory insertion and beta-hydride elimination
35. What is the term used to describe the addition of a group to a metal center, increasing its coordination number and oxidation state? — Oxidative addition
36. Consider the reaction: LnM-R + X-Y -> LnM(X)(Y)(R). This reaction is an example of: — Oxidative addition
37. What is the term for an organometallic compound where the organic group is bonded to the metal through a carbon atom that is part of a double or triple bond? — Pi-bonded complex
38. Ferrocene, with its sandwich structure, is a classic example of which type of organometallic compound? — Pi-bonded organometallic
39. Organometallic compounds are crucial in the development of new materials because they can serve as precursors for: — Pure metals and metal oxides
40. Which of the following organometallic compounds is known for its use as an anti-knock agent in gasoline (though now largely phased out)? — Tetraethyllead
41. Which of the following is an example of a pi-complex organometallic compound? — Ferrocene ([Fe(C5H5)2])
42. In organometallic chemistry, what does the term 'ligand' refer to? — The organic group attached to the metal
43. The term 'hapticity' (η) in organometallic chemistry refers to: — The number of atoms in a ligand that are bonded to the metal
44. What is the role of organometallic compounds in homogeneous catalysis? — They are the active catalytic species
45. What is the primary role of ligands in stabilizing organometallic complexes? — To satisfy the metal's coordination sphere and electronic requirements
46. What is the primary function of organometallic compounds in Ziegler-Natta catalysis for olefin polymerization? — To initiate chain growth
47. What type of reaction is involved when a metal-alkyl bond is formed by transferring an organic group from one metal to another? — Transmetallation
48. Which of the following pairs of ligands are most likely to undergo reductive elimination? — A hydride and an alkyl ligand
49. Which of the following is a well-known example of a homogeneous catalyst involving organometallic complexes? — Wilkinson's catalyst
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