The forward reaction from (a) to (b) is of principal reaction type: Blank 1 Question 8[select: , Reductive Elimination, β-Hydride Elimination, 1,2-migratory Insertion, α-Hydride Abstraction, 1,1-migratory Insertion, Reductive Cleavage, Oxidative Coupling, Salt Elimination, α-Hydride Elimination, σ-bond metathesis, Oxidative Addition, Protonolysis]

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The question asks about the forward reaction from (a) to (b) and labels it as a principal reaction type. In this case, the provided correct answer is Oxidative Coupling.
Option by option analysis:
- Oxidative Coupling (the endorsed choice): This type involves the coupling of two fragments with an overall increase in oxidation state on a metal center, typically forming a new M–X or M–R–M bond as a result of oxidative addition-like or coupling steps. When the context explicitly points to a forward transformation from (a) to (b) that constitutes a coupling event with oxidation state change, labeling it as Oxidative Coupling is appropriate and aligns with common organometallic reaction classifications.
- Reductive Elimination: This process forms a bond between two ligands and releases them from a metal, reducing the metal’s oxidation state back toward the original state. It is typically a step that creates a bond between two ligands already bound to the metal and does not describe a forward coupling between separate species (a) and (b) as a primary reaction type in this context.
- β-Hydride Elimination: Involves transfer of a β-hydrogen to the metal center, generating a metal hydride and an alkene. This is a migratory process occurring within alkyl–metal intermediates and is not a generic description of a forward (a) to (b) coupling step.
- 1,2-migratory Insertion: An inserted fragment migrates to a first-donor site within the metal–ligand framework, typically modifying the coordination sphere rather than constituting a cross-coupling between two separate fragments (a) and (b).
- α-Hydride Abstraction or α-Hydride Elimination: These refer to hydride transfer events involving the alpha position relative to a coordinating atom, not to a forward coupling between two molecular fragments as described.
- 1,1-migratory Insertion: A less common variant where migration occurs over a single bond; still more of an intramolecular rearrangement context, not a forward intermolecular coupling from (a) to (b).
- Reductive Cleavage: This would imply bond cleavage with reduction, which does not capture an oxidative coupling event between two fragments.
- Salt Elimination: A plausible description in certain salt-forming processes, but not typically the principal reaction type for a forward (a) to (b) transformation in organometallic schemes.
- σ-bond metathesis: A metathesis involving exchange of σ-bonds; while related to bond shuffling, it is not the standard label for a forward (a) to (b) coupling if the emphasis is on oxidative coupling processes.
- Oxidative Addition: This step increases the oxidation state by adding a fragment to the metal, but in many schematics Oxidative Addition is a precursor to subsequent coupling rather than the final forward coupling from (a) to (b) itself.
- Protonolysis: Involves protonolysis of a metal–ligand bond, releasing a molecule (often H–X) and generating a vacant site; this does not describe a coupling between two fragments (a) and (b).
- Salt Elimination (reiterated): See above; not a standard label for the principal forward coupling event in this context.
- The redundancy and mixture of terms like α-Hydride Elimination appearing multiple times underscores that only one term correctly captures a forward cross-coupling between fragments (a) and (b) in this scenario, namely Oxidative Coupling.

In summary, given that the question identifies the forward transformation from (a) to (b) as a principal reaction type and the provided answer is Oxidative Coupling, this option correctly reflects a coupling process that involves oxidation-state change characteristic of oxidative coupling scenarios. The other options describe related but distinct processes (elimination, migratory insertion, protonolysis, metathesis, etc.) that do not match the described forward coupling event between two fragments (a) and (b) in the given context.

General Inorganic Chemistry (CHEM2007 UNUK) (FYR1 24-25) Test Yourself 4

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