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Isomers of CycloHexane

  1. Oct 21, 2014 #1
    Question
    Find out the total number of possible isomers with molecular formula C6H12 that contain a cyclobutane ring.

    Attempted Solution
    Untitled.png

    In Compound 3, Optical Isomerism is possible (geometrical isomerism is also possible but is neglected due to presence of optical isomerism) about both the branches, hence it will be counted as 4 isomers

    In Compound 4, Geometrical Isomerism is possible about the two branches, therefore it will be counted as 2 isomers

    Counting All
    : 1 + 1 + 4 + 2 = 8

    Hence there are 8 isomers possible

    Problem
    The book where I found this question says that it consists only of 7 isomers.

    Please help me out. Thanks for your time.
     
  2. jcsd
  3. Oct 21, 2014 #2

    Borek

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    Staff: Mentor

    Check 3rd.
     
  4. Oct 21, 2014 #3
    Yes, I was suspecting the argument with compound 3.

    Please Verify
    Compound 3 will have cis & trans forms. The cis form due to symmetry would not have optical isomers whereas the trans form would have optical isomers. As a result there would be three isomers (rather than 4).
     
  5. Oct 21, 2014 #4

    Borek

    User Avatar

    Staff: Mentor

    Yes, 3 not 4.
     
  6. Oct 22, 2014 #5
    thank you for your time :)
     
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