2302627 (2023)

Which of the following species is most stable?

• [Cp₂Fe]⁺

• [Cp₂Co]

• [Cp₂Co]⁺

• [Cp₂Ni]³⁺

What is likely to be M in the complex [CpM(CO)₂(linear-NO)]Cl₃ ?

• Fe

• Co

• Ni

• Cu

An 18 e^- d⁶-ML₆ complex prefers to undergo dissociative substitution over associative substitution. Which geometry is UNLIKELY for its ML₅ intermediate?

• Square pyramidal

• Trigonal bipyramidal

• Distorted trigonal bipyramidal

Which species has the highest trans effect (sigma donor + pi acceptor)?

• ethylene

• trimethylphosphine

• bromide

• pyridine

What is the reversed reaction of 1,2-migratory insertion?

• Dissociative substitution

• Elimination

• Oxidative addition

• Metathesis

Alpha-hydride elimination of a metal complex leads to the formation of ________.

• Metal-alkene complex

• Metal-carbon complex

• Metal-carbonyl complex

• Metal-carbene complex

Which of the following is NOT present in the Zeist's salt?

• Alkene ligand

• Platinum ion

• Negative charge of the complex

• Bromide ligand

Which of the following ligands can form a metallacyclopropene with a metal center?

• Alkene

• Alkyne

• Allyl

• Alkane

What is the most common cause for the instability of metal-alkyl complexes?

• Alpha-hydride elimination

• Beta-hydride elimination

• Gamma-hydride elimination

• Reductive elimination

What is NOT true about Fischer carbene complexes?

• It is counted as 2 e^-, neutral.

• The metal center should have low oxidation state.

• There must be at least pi-donor substituents on the carbene carbon.

• Other ligands should be pi-donor ligands.