Question 1

Which molecular orbital is the HOMO in the metallocene Cp2Fe, based on the D5d symmetry diagram shown in the first image?

Accepted Answer

$$e_{1g}$$

Question 2

According to the second image, what is the primary factor responsible for the increase in M–C bond distance as you move from Cp2Fe to Cp2Ni?

Accepted Answer

Population of $$e_{1g}^*$$ orbitals

Question 3

In the context of metal–alkene bonding, which interaction is depicted in the third image as the dominant contributor to bond strength?

Accepted Answer

$$\pi$$ back-donation from metal to alkene

Question 4

The fourth image shows a Fischer carbene. Which orbital interaction is characteristic of Fischer carbenes?

Accepted Answer

$$\sigma$$ donation from carbene to metal

Question 5

The fifth image shows a Schrock alkylidene. What is the electronic configuration of the carbene carbon in this complex?

Accepted Answer

Triplet ($$sp^2) $$with two unpaired electrons

Question 6

In the sixth image, why is the Ta complex labeled 'unstable' after $$\alpha-H $$abstraction?

Accepted Answer

No $$\beta-$$hydrogen is available for elimination

Question 7

The seventh image illustrates bonding in a metal–alkyl complex. Which type of orbital interaction is shown?

Accepted Answer

$$\sigma$$ donation from alkyl to metal

Question 8

The eighth image shows a metal–alkyl complex with a different electronic configuration. What is the main difference compared to the previous image?

Accepted Answer

The alkyl group is a radical

Question 9

In the ninth image, what is the general synthetic strategy for Fischer carbene complexes?

Accepted Answer

Nucleophilic addition to a metal carbonyl followed by electrophilic substitution

Question 10

The tenth image shows a Re complex undergoing hydride abstraction. What is the product formed?

Accepted Answer

A metal alkylidene complex

Question 11

In the eleventh image, what is the effect of $$\pi$$ back-donation from Cr to CO on the C–O bond?

Accepted Answer

It weakens the C–O bond by populating $$\pi^*$$ orbitals

Question 12

The twelfth image shows the mechanism of alkene metathesis. Which intermediate is crucial for this reaction?

Accepted Answer

Metallacyclobutane

Question 13

In the thirteenth image, which catalyst is used for ring-opening metathesis polymerization (ROMP) of norbornene?

Accepted Answer

Grubbs' 1st generation catalyst

Question 14

The fourteenth image shows molecular orbitals in a cluster compound. What is the main bonding interaction in the tetrahedral cluster?

Accepted Answer

Delocalized bonding involving all four metal centers

Question 15

In the fifteenth image, what is the effect of increasing Lewis acidity on the structure of Me2SnF polymers?

Accepted Answer

Transition from 1D to 2D polymeric structure

Question 16

The sixteenth image shows two types of Sn polymer networks. What is the main difference between them?

Accepted Answer

Vertex-sharing vs edge-sharing octahedra

Question 17

In the seventeenth image, which geometry is associated with a distorted tetrahedral complex?

Accepted Answer

Four-coordinate

Question 18

The eighteenth image shows a Rh cluster with multiple CO ligands. What is the likely symmetry of this cluster?

Accepted Answer

Tetrahedral

Question 19

In the nineteenth image, which irreducible representation corresponds to the $$z$$ axis in $$C_{3v}$$ symmetry?

Accepted Answer

$$A_1$$

Advanced Organometallic Chemistry: Structure, Bonding, and Reactivity of Transition Metal Complexes

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