Worksheet: Conjugated Systems in Molecular Orbital Theory

In this worksheet, we will practice using particle-in-a-box and node-counting arguments to predict molecular orbital diagrams for conjugated molecules.

Q1:

Butadiene contains two occupied 𝜋 bonding orbitals and two unoccupied 𝜋 antibonding orbitals. The 𝜋 electrons are delocalized between the four C atoms.

C H C H H C H C H H

Which of the following diagrams illustrates the 𝜋 bonding orbital with the highest energy?

  • A
  • B
  • C
  • D
  • E

An electron is added to a butadiene molecule. Which of the following diagrams illustrates the 𝜋 antibonding orbital occupied by the additional electron?

  • A
  • B
  • C
  • D
  • E

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