What are the differences between butyl and propyl compounds in terms of their chemical properties and applications?

Butyl compounds have longer carbon chains than propyl compounds, making them more hydrophobic and less reactive. Butyl compounds are often used as sealants, adhesives, and rubber materials due to their flexibility and durability. Propyl compounds, on the other hand, are more polar and reactive, making them suitable for use in solvents, pharmaceuticals, and fragrances.