Question

What geometric isomers are possible for `"2-octene"`?

Answer 1

Well, it's an olefin with a `C=C` bond.......

Explanation:

And we could draw the molecular formula as.......

`H_3stackrel(1)C-stackrel(2)CH=stackrel(3)CHstackrel(4)CH_2stackrel(5)CH_2stackrel(6)CH_2stackrel(7)CH_2stackrel(8)CH_3`

At `stackrel(2)C` we insert the olefinic bond, the so-called site of unsaturation. And we note that molecule would support geometric isomerism in that the double bond generates cis and trans isomers about `C_2`, `C_3`.

What would we call......

`H_2stackrel(1)C=stackrel(2)CH_2stackrel(3)CH_2stackrel(4)CH_2stackrel(5)CH_2stackrel(6)CH_2stackrel(7)CH_2stackrel(8)CH_3`

Would this molecule be isomeric?