Acetylene, the simplest alkyne, is used in torches to generate temperatures of around 3,000 degrees Celsius to weld metal. It is also used as a starting material in the synthesis processes used to make polymers, and as a solvent. Alkynes are triple curve hydrocarbons that have a variety of applications because of their high reactivity.
Unlike alkanes and alkenes, which have one and two bonds connecting the carbon atoms respectively, alkynes have three bonds connecting the carbons, making them extremely unsaturated. A carbon atom has four valence electrons, making them capable of connecting to up to four other elements. The triple bond can easily break in an alkyne, making it an important starting material in synthesis.