Alkynes are named with the greek prefix system without any additional letters. Examples include ethyne or octyne. In parent chains with 4 or more carbons, it is necessary to say where the triple bond is located. For octyne, one can either write 3-octyne or oct-3-yne when the bond starts at the 3rd carbon. The lowest number possible is given to the triple bond. When no superior functional groups are present, the parent chain must include the triple bond even if it isnot the longest possible carbon chain in the molecule