A metallo cyclopentadiene intermediate occurs in a 2+2+2 ["two plus two plus two"] trimerization of this molecule to form benzene.
The generation of ethylene gas from this molecule is used to assess nitrogenase activity in an ARA assay. Shirakawa, MacDiarmid and Heeger won the 2000 Nobel Prize in Chemistry for synthesizing a conducting polymer of this molecule. The classic example of a template reaction is this compound's cyclo-oligomerization to cyclo-octa-tetra-ene. Cyanogen can be produced when this molecule and nitrogen are reacted in the presence of a spark. A metallo cyclopentadiene intermediate occurs in a 2+2+2 ["two plus two plus two"] trimerization of this molecule to form benzene. Walter Reppe pioneered studies of its reactivity. Hydroboration-oxidation of this molecule results in acetaldehyde. It has two hydrogens with pKa's ["p-k-aze"] of 25. Arc welding has largely replaced welding that used this molecule as a fuel source. For 10 points, name this simplest alkyne.
The generation of ethylene gas from this molecule is used to assess nitrogenase activity in an ARA assay.
acetylene [or ethyne; or C2H2]