Exam 3: Interchapter 1molecular Orbital Theory and Chemical Reactions

In the elementary reaction step shown below,identify the reactant that contributes the HOMO and the reactant that contributes the LUMO.

Draw the energy levels of the transition-state molecular orbitals based on the HOMO-LUMO interaction below.

Which of the following transition states are forbidden?

Would the transition state shown below lead to a successful reaction? Why or why not?

According to FMO theory,an allowed transition state requires that the HOMO and the LUMO have which of the following?

Draw the HOMO-LUMO interaction that occurs in the transition state of the second step of the reaction shown below (that is,the bromide leaving).Label the HOMO and the LUMO.

What is meant by the term frontier molecular orbital?

Which of the following transition states will be allowed?

Construct the MO energy-level diagram for acetone,and then use the diagram to determine the HOMO and the LUMO.

Briefly explain why the HOMO and the LUMO must have similar energies in order for a reaction to occur.

Draw the HOMO-LUMO interaction that stabilizes the transition state of the 1,2-hydride shift that would occur in the molecule below.

Use FMO theory to rationalize the different stereospecificity of S_N1 and S_N2 reaction mechanisms.

Briefly explain what determines whether a particular transition state is "allowed" or "forbidden."

Which of the following would be expected to contribute the HOMO to a transition-state complex?

According to frontier molecular orbital theory,a reaction is favorable if which of the following is true?

Frontier molecular orbital theory can be used to predict which of the following about a chemical reaction?

Identify the HOMO and the LUMO that participate in the following reaction.