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How many structural and cis-trans isomers are there for dichloropropene, C3 H4 Cl

  1. Nov 22, 2011 #1
    20 How many structural and cis-trans isomers are there for dichloropropene,
    C3H4Cl2. I could find a total of 4, with 2 structural and 2 cis trans. But the answer sheet says 7!! can someone tell me all the isomers it can form?
     
  2. jcsd
  3. Nov 22, 2011 #2

    Borek

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    Staff: Mentor

    7 there are.

    List those you have (or draw them).
     
  4. Nov 22, 2011 #3
    I found five
    the first is 1,1 dichloropropene
    the second is 1,3 dichloropropene(since this has cis-trans I count it as two)
    the fourth is 1,2 dichlropropene (again this shows cis-trans so I count it as two)
    Thats it, i cant find anymore!
     
  5. Nov 23, 2011 #4

    Borek

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    Staff: Mentor

    What if neither Cl atom is in the 1 position?
     
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