Alkanes, alkenes and aromatics

This crossword was created by Dr John with EclipseCrossword by Green Eclipse Software — www.eclipsecrossword.com

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Across 1. C6H12, and in a ring. 5. Same number of carbons as a 50p has edges 6. Brings home the bacon 11. C5H10 14. Four legs, fur and purrs a lot 15. Has no double bonds, just carbons and hydrogens 17. Soars a lot and has great eyesight 18. C2H6 20. A dozen? It's a big one, this. 21. The lighter of the two gases used in camping gas cylinders. 22. Used to make a polymer which is used a lot for packing things in boxes.

Down 2. Abominable 3. Can be turned into polythene 4. Also known as toluene, it has seven carbons, and is not an alkane 6. Has three carbons and one double bond 7. The one ring to rule them all? 8. A square ring? 9. C5H12 10. C6 and NOT an alkane or alkene, it's the simplest aromatic one 12. Used in camping gas cylinders 13. Used as a rating for petrol 16. Six carbons, used as a solvent 19. Natural gas is mainly this