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Homework Help: Organic cis- tran- structure

  1. Sep 2, 2009 #1
    1. The problem statement, all variables and given/known data

    What's the cis and trans structure name for this formula?

    2. Relevant equations

    3. The attempt at a solution

    I've drew the ciis and trans structure

    H\ /H
    C = C
    / \
    CH3 CH3
    this is the cis

    the tran is similar to the cis except the H and CH3 is at the top, CH3 and H is at the bottom of the double bonded C. I'm not sure what's the name of it. i know theres four carbon, so butane is usually what we say it is, but it has a double bond so its butene.
    So is it cis-butene and trans-butene? I'm not really sure. please help..thank you in advance.
  2. jcsd
  3. Sep 3, 2009 #2
    We use the terms cis-but-2-ene (best be clear where the double bond is) and trans-but-2-ene in my chem classes, so I think they're fine.
  4. Sep 3, 2009 #3


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    Science Advisor
    Homework Helper
    Gold Member

    Best to use the common nomenclature for this compound. Don't split up the word 'butene' as 'but-2-ene'. Use '2-butene'.
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