Homologous series
Melting points from 1-propyne to 1-eicosyne
| Index | Name | Value |
| 3 | 1-propyne | -101.5 |
| 4 | 1-butyne | -122.5 |
| 5 | 1-pentyne | -98 |
| 6 | 1-hexyne | -124 |
| 7 | 1-heptyne | -81 |
| 8 | 1-octyne | -79 |
| 9 | 1-nonyne | -50 |
| 10 | 1-decyne | -36 |
| 11 | 1-undecyne | -33 |
| 12 | 1-dodecyne | -19 |
| 13 | 1-tridecyne | -5 |
| 14 | 1-tetradecyne | 0 |
| 15 | 1-pentadecyne | 10 |
| 16 | 1-hexadecyne | 15 |
| 17 | 1-heptadecyne | 22 |
| 18 | 1-octadecyne | 28 |
| 19 | 1-nonadecyne | 38 |
| 20 | 1-eicosyne | 36 |
