ETHENE
| Date | Clue |
|---|---|
| 2026-01-25 | World's most-produced organic compound |
| 2026-01-11 | Compound that ripens bananas |
| 2019-03-24 | Hydrocarbon gas |
| 2013-06-28 | Emission of ripening fruit |
| 2010-11-12 | Fruit-ripening gas |
| 2010-10-03 | Anesthetic gas |
| 2002-09-11 | Anesthetic gas |
| 2001-08-24 | Flammable gas |
| 2001-03-11 | Gas used as an anesthetic |
| 2001-01-12 | C2H4 |