16. Conjugated Systems

What does it mean for a molecule or intermediate to be conjugated?

Which of the following molecules is conjugated?

a. How many linear dienes have molecular formula C6H10? (Disregard cis–trans isomers.) b. How many of the linear dienes in part a are conjugated dienes?

Answer the following questions for the molecular orbitals (MOs) of 1,3,5,7-octatetraene: g. How many nodes does the highest-energy MO of 1,3,5,7-octatetraene have between the nuclei?

Answer the following questions for the molecular orbitals (MOs) of 1,3,5,7-octatetraene: e. Which MO is the HOMO and which is the LUMO in the excited state?

Answer the following questions for the molecular orbitals (MOs) of 1,3,5,7-octatetraene: d. Which MO is the HOMO and which is the LUMO in the ground state?