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Name of Alkane [Pic Included]

  1. Sep 12, 2009 #1
    1. The problem statement, all variables and given/known data

    2lswshs.jpg
    Enter the name for the above alkane.

    2. Relevant equations

    How to count Carbons and Hydrogen's.

    3. The attempt at a solution

    My answer was "Undecane" because I counted 11 Carbons and 24 Hydrogens but it says im wrong. Any Idea?
     
    Last edited: Sep 12, 2009
  2. jcsd
  3. Sep 12, 2009 #2

    symbolipoint

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    FIND THE LONGEST STRAIGHT CHAIN OF CARBONS. After that,... adjust the name according to the branches.

    Big hint: 11 is NOT the number of carbons in the longest chain.
     
    Last edited: Sep 12, 2009
  4. Sep 12, 2009 #3
    so the longest chain has 8 carbon atoms, with an ethyl group coming off the 3rd atom, and a methyl group coming off the 5th atom. SO...

    3-ethyl 5-methyl octane ?
     
  5. Sep 13, 2009 #4

    symbolipoint

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    Good for the identification details. I'm no longer sure about the punctuation; maybe someone else will say. (Maybe a quick review in wikipedia?)
     
  6. Sep 13, 2009 #5

    symbolipoint

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    OK, I know you nearly had it perfectly.

    3-ethyl-5-methyloctane
     
  7. Sep 13, 2009 #6
    hi...i just get a bit confused on when to use the brackets and commas in a name or not...
     
  8. Sep 13, 2009 #7
    thanks you . .
     
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