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Need help naming a hydrocarbon

  1. Nov 30, 2014 #1
    1. The problem statement, all variables and given/known data
    chemproblem.png


    3. The attempt at a solution
    The answer is supposedly C but I cant figure out why its not E.
    first I count the number of C in the longest chain. There are 7 C and there are only single bonds so the the root and suffix is heptane. there is a chain with one C (methyl) and one with 3 C (propyl) and they are both attached the the third carbon counting from the side that gives the smallest numbers. listing in alphabetical order the name should be 3-methyl-3-propylheptane
     
  2. jcsd
  3. Nov 30, 2014 #2

    Borek

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    You have to select the longest chain. Which number is higher 7, or 8?
     
  4. Nov 30, 2014 #3
    I am confused. To me it seems that there are 3 chains, one with 7, one with 3 and one with 1 carbons
     
  5. Nov 30, 2014 #4

    Borek

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    E can't be right as it calls for HEPTane, when there is a possible OCTane chain.
     
  6. Nov 30, 2014 #5
    forgive me if it is obvious but I don't see where the octane chain could be
     
  7. Nov 30, 2014 #6

    Bystander

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    "Longest chain" doesn't necessarily mean longest straight line.
     
  8. Nov 30, 2014 #7

    Borek

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    Start from the leftmost carbon, turn right (down) at the ternary carbon.
     
  9. Nov 30, 2014 #8
    ahh i get it now. thanks guys
     
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