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Stereoisomer: 2-methyl-2-pentene

  1. Oct 9, 2014 #1
    1. The problem statement, all variables and given/known data

    The compound 2-methyl-2-pentene:

    Select one:
    a. has no structural or geometric isomers
    b. has 2 structural alkene isomers, each of which has an E isomer and a Z isomer form.
    c. has 5 structural isomers
    d. has 3 structural isomers
    e. exists as E and Z isomers

    3. The attempt at a solution

    So the wording of this question confuses me a bit, I took that when it said the compound 2-methyl-2-pentene it was just talking about c6h12 - if this is not the case and I've understood it horribly wrong please inform me :)

    So straight away I cross out A just because it's obvious that at least 1 structural isomer exists. I then eliminate C and D because there are more than 5 structural isomers. I then cross out B because there are more than 2 alkene isomers 1/2/3-hexene eg. So I guess I would go with E as my answer. I know it's an easy question but I always overthink them and end up getting them wrong so this is more to help me understand the question and clear up any misconceptions I may have. Thanks
     
  2. jcsd
  3. Oct 9, 2014 #2

    Borek

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    Staff: Mentor

    E is definitely not a correct answer, draw the molecule - does it have E, Z isomers?
     
  4. Oct 9, 2014 #3
    Damn you're 100% right! I had that originally but then I started to think of the question as talking about all C6H12 molecules. I'm a but confused as what constitutes an isomer in relation to this question - I assume it's not talking about all C6H12 isomers so does that mean it's only taking about the location of the double bond and methyl group? Is it C then? It seems to have a large number of structural isomers to me.
     
  5. Oct 9, 2014 #4

    Borek

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    Staff: Mentor

    TBH, I am not sure what the correct answer is - I don't have time to investigate, and just intuition is not enough. To me it looks like it talks about all C6H12 molecules.
     
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