This document lists the names, condensed formulas, fully expanded formulas, and partially expanded formulas for several alkynes with carbon chains of 2 to 7 carbons. It shows that ethyne (acetylene) has the formula C2H2, propyne has C3H4, butyne has C4H6, and so on up to heptyne with C7H12 as the carbon chain increases in length. The formulas progress from condensed to fully expanded to show the carbon-carbon and carbon-hydrogen bonds explicitly.