Unsaturated Hydrocarbons Examples
Extra 'a' is added to the word root when primary prefix contains di, tri etc.
Buta-1,3-diene
3-Methylpent-1-yne
Hexa-1,3,5-triyne
2-Methylbuta-1,3-diene (not 3-Methylbuta-1,3-diene)
Double bond's end is preferred for numbering when their is a choice between double and triple bonds.
3-Methylpent-1-en-4-yne