This compound reacts with 1,3-butaÂ·diene ("one three" byu-tah-"DIE"-een) to give 1,4-cycloÂ·hexaÂ·diene in a DielsÂ–Alder reaction.
Nitrogen  xation is assayed by an experiment in which this compound is reduced. The polymer of this compound, doped with iodine, was the  rst conducting polymer discovered. Traditionally, Reppe ("REP"-puh) chemistry refers to carbonylation of this compound. This compound reacts with 1,3-butaÂ·diene ("one three" byu-tah-"DIE"-een) to give 1,4-cycloÂ·hexaÂ·diene in a DielsÂ–Alder reaction. The diÂ·cyano derivative of this compound has the highest known adiabatic  ame temperature. Calcium carbide reacts with water to form this compound, three moles of which can be combined to make one mole of benzene with no byproducts. This compound's two protons each have a pÂ·KÂ·a around 25. It is usually the "fuel" in oxy-fuel cutting. For 10 points, name this compound with formula C2H2 (C-2-H-2), the simplest alkyne, which is used in welding torches.
Nitrogen  xation is assayed by an experiment in which this compound is reduced.
acetylene [or ethyne; accept C2H2 before "C2H2"]