Question 1

Which of the following best describes organometallic chemistry?

Accepted Answer

The study of compounds containing metal-carbon bonds.

Question 2

Which Nobel Prize-winning discovery is considered the beginning of modern organometallic chemistry?

Accepted Answer

The synthesis of ferrocene.

Question 3

Which of the following is NOT a common method for characterizing organometallic carbonyl complexes?

Accepted Answer

Gas chromatography (GC)

Question 4

The 18-electron rule for transition metal complexes is analogous to which rule for main group elements?

Accepted Answer

The octet rule

Question 5

Which of the following statements about π-backbonding in metal carbonyl complexes is TRUE?

Accepted Answer

π-backbonding decreases the CO stretching frequency.

Question 6

Given the following IR stretching frequencies for CO ligands: $$[Ti(CO)_6]^{2-} (1750 cm$^{-1}$$), $$[V(CO)_6]^- (1860 cm$^{-1}$$), $$[Cr(CO)_6] (2000 cm$^{-1}$$), $$[Mn(CO)_6]^+ (2090 cm$^{-1}$$), which complex has the greatest degree of π-backbonding?

Accepted Answer

$$[Ti(CO)_6]^{2-}$$

Question 7

Which of the following ligands is considered a strong π-acceptor and is often used to tune the electronic properties of metal centers?

Accepted Answer

CO

Question 8

In the context of the 18-electron rule, what is the total electron count for $$[Fe(CO)_5]$$ using the covalent model?

Accepted Answer

$$18$$

Question 9

Which of the following statements about ligand dissociation in organometallic complexes is correct?

Accepted Answer

Ligand dissociation decreases the electron count by 2.

Question 10

Which process is the reverse of oxidative addition in organometallic chemistry?

Accepted Answer

Reductive elimination

Question 11

Which of the following best describes the Dewar-Chatt-Duncanson model for alkene binding to transition metals?

Accepted Answer

The alkene donates electrons to the metal via σ-bonding, and the metal donates electrons back via π-backbonding.

Question 12

Which of the following is a real-world application of organometallic chemistry?

Accepted Answer

Production of polyethylene via Ziegler-Natta catalysis

Question 13

Which of the following statements about the cone angle of phosphine ligands is TRUE?

Accepted Answer

A larger cone angle can increase the rate of ligand dissociation.

Question 14

Which of the following is a key step in the Monsanto acetic acid process?

Accepted Answer

Oxidative addition of methyl iodide to $$[Rh(CO)_2I_2]^-$$

Question 15

Which of the following best describes a 1,2-migratory insertion reaction?

Accepted Answer

A σ-bound group migrates to a π-system ligand, reducing the electron count by 2.

Question 16

Which of the following is TRUE regarding β-hydride elimination in organometallic chemistry?

Accepted Answer

It is the reverse of migratory insertion.

Question 17

Which of the following is a characteristic of a bridging carbonyl ligand compared to a terminal carbonyl ligand?

Accepted Answer

Bridging carbonyls have lower CO stretching frequencies.

Question 18

Which of the following statements about the electron counting in $$[Cp_2TiCl_2] ($$where Cp = cyclopentadienyl) is correct using the covalent model?

Accepted Answer

Ti contributes 4 electrons, each Cp contributes 5 electrons, and each Cl contributes 1 electron, totaling 16 electrons.

Question 19

Which of the following is TRUE about the stability of alkene complexes with transition metals?

Accepted Answer

Monosubstituted alkenes are more stable than trisubstituted alkenes.

Organometallic Chemistry: Structures, Bonding, and Reactivity

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