Organic Chemistry has been likened to a spiral staircase in which we need to look in all directions in order to make safe progress. The same topics appear over and over and we keep coming back to the same ideas from Organic 1. Delocalization possibilities explain many acid strengths found within the Acid-Base chapter, which is central to many reaction pathways that follow. The basic Organic ideas of Substitution, Elimination, and Addition reactions sets up most of the second semester.