2-heptuna
3-etil-1-pentuna
3,4-dimetil-1-heksuna
1. Ch₃-Ch=Ch-Ch₂-Ch₂-Ch₂-Ch₃
2. Ch≡C-Ch-Ch₂-Ch₃
I
Ch₃
3. Ch≡C-Ch-Ch-Ch₂-Ch₃
I I
Ch₃ Ch₃
1. Ch₃-Ch=Ch-Ch₂-Ch₂-Ch₂-Ch₃
2. Ch≡C-Ch-Ch₂-Ch₃
I
Ch₃
3. Ch≡C-Ch-Ch-Ch₂-Ch₃
I I
Ch₃ Ch₃