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.

1. Nombre Formula condensada Formula desarrollada Formula semi desarrollada
Etino C2H2 H-C C-H CH CH
Propino C3H4 H
H-C C-C-H
H
CH C-CH3
Butino C4H6 H H
H-C C-C-C-H
H H
CH C-CH2-CH3
Pentino C5H8 H H H
H-C C-C-C-C-H
H H H
CH C-CH2-CH2CH3
Hexino C6H10 H H H H
H-C C-C-C-C-C-H
H H H H
CH C-CH2-CH2-CH2-CH3

2. Heptino C7H12 H H H H H
H-C C-C-C-C-C-C-H
H H H H H
CH C-CH2-CH2-CH2-CH2-
CH3