Why do many esters have pleasant fruit and flower odors?

Many esters of low molecular weight are characterized by their pleasant, fruity, and floral odors. These compounds are naturally occurring and are responsible for the distinct fragrances and flavors found in many fruits and flowers, such as the scent of bananas or pineapples.12

The ability of these substances to produce an odor is primarily due to their volatility, which allows their molecules to be carried by air currents into the nostrils. While there is no single chemical property that dictates a specific scent, the pleasant aromas of these esters are a result of their specific molecular structure and the arrangement of their atoms. Because they are volatile and possess these characteristic scents, they are frequently utilized in the production of synthetic flavors, perfumes, and cosmetics.31