problem 1.23

[Derek Li--Dis1a]

I have a question on the thought process for question 23?

23. Draw all possible constitutional and geometric isomers of alkenes with the molecular formula C5H10.



These are the answers in the back. I understand the first one (constitutional isomer), 2nd one (constitutional isomer) , and third one (geometric isomer--cis). However, I do not understand the last three.

Thanks!

[Chem_Mod]

The last three are simply constitutional isomers of the first one. Same formula, different connectivity.