4-Octyne
4-Octyne is an alkyne, a type of organic compound containing a carbon-carbon triple bond. More specifically, it is an internal alkyne, meaning the triple bond is located between two internal carbon atoms in the carbon chain, rather than at the end of the chain (which would make it a terminal alkyne).
The "4-" in the name indicates that the triple bond is located between the fourth and fifth carbon atoms in an eight-carbon (oct-) chain. Its molecular formula is C8H14.
4-Octyne is a colorless liquid at room temperature and pressure. Like other alkynes, it can undergo a variety of chemical reactions, including hydrogenation, hydration, and addition reactions. It is often used as a building block in organic synthesis. Due to the presence of the triple bond, 4-octyne is relatively unsaturated, making it more reactive than its corresponding alkane, octane.