Conjugated molecules have the ability to absorb light energy and kick electrons up to a higher energy state. This may have an effect on our HOMO/LUMO orbitals.
Concept #1: Ground vs. Excited States
Practice: 4-Methylbenzylidene camphor (4-MBC) is used by the cosmetic industry for its ability to protect the skin against UV-B radiation. Circle the part of the molecule that you theorize is responsible for its effects on UV light.