| Answer | Crossword Clue |
|---|---|
| ALKENE | Unsaturated hydrocarbon |
| OLEFIN | Unsaturated hydrocarbon |
| TOLAN | An unsaturated hydrocarbon |
| ENE | Unsaturated hydrocarbon suffix |
| pentylene | an unsaturated hydrocarbon of the olefine series also PENTENE |
| pentylenes | PENTYLENE, an unsaturated hydrocarbon of the olefine series also PENTENE |
| cyclopentadiene | a colourless liquid unsaturated cyclic hydrocarbon obtained in the cracking of petroleum hydrocarbons and the distillation of coal tar, used in the manufacture of plastics and insecticides |
