Final answer:
Ethyl butyrate is responsible for the characteristic odor of pineapple and is classified as an ester, a compound with pleasant fruity scents commonly found in perfumes and fruits.
Step-by-step explanation:
The characteristic odor of pineapple is due to an organic compound known as ethyl butyrate, which can be classified as an ester. Esters are known for their pleasant scents and are commonly found in fruits and used in perfumes. The specific structure of ethyl butyrate contributes to the fruity aroma associated with pineapple.