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Worksheet: Conjugated Systems in Molecular Orbital Theory

Q1:

Butadiene contains two occupied ฯ€ bonding orbitals and two unoccupied ๐œ‹ โˆ— antibonding orbitals. The ๐œ‹ electrons are delocalised between the four C atoms.

C H C H H C H C H H

Which of the following diagrams illustrates the ๐œ‹ 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 ๐œ‹ โˆ— antibonding orbital occupied by the additional electron?

  • A
  • B
  • C
  • D
  • E