1

Chapter 20

Conjugated Systems

2

Heat of Hydrogenation

3

Ethylene Molecular Orbitals

4

Butadiene Molecular Orbitals

5

UV-Visible Spectroscopy

6

7

8

9

How We See

10

11

Diels-Alder Stereochemistry

12

Sigmatropic RAR Frontier Orbitals