Because they are volatile in nature.
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Esters have a sweet fruity smell because they contain an oxygen atom that interacts with receptors in our nose, activating our sense of smell. The specific arrangement and types of chemical bonds in esters give them their characteristic fruity aroma.
Carboxylic acids usually have a strong, pungent odor, often described as sour or vinegar-like. Esters, on the other hand, have a sweet, fruity smell. This difference in odor is due to the functional groups present in each compound.
Esters generally have a sweet, fruity, and pleasant aroma. The specific smell can vary depending on the type of ester but often resembles that of fruits like banana, apple, or strawberry.
The yellow bell pepper has a mild, sweet aroma that is slightly fruity and fresh.
An example of a fruity odor could be the smell of a ripe peach or a freshly cut orange. These scents are often sweet, fresh, and vibrant, reminiscent of various fruits found in nature.
Such compounds are mostly esters.