This lecture discusses the importance of organic chemistry, focusing on aroma compounds found in common flowers. It presents a graphic overview of various volatile aroma compounds that contribute to the scents of flowers, highlighting the significant variations between species. The instructor explains that while the graphic provides a broad overview, it is not definitive. The lecture also covers the chemical structures and characteristics of these compounds, including their roles in nature and their relevance in organic chemistry. Additionally, the lecture touches on the synthesis and reactions of alkenes, emphasizing their importance in both natural and synthetic processes. The instructor illustrates how these compounds are integral to understanding the chemistry of everyday life, particularly in the context of floral scents and their applications in various fields.