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Which is an Aromatic Compound

  1. Jan 29, 2016 #1
    1. The problem statement, all variables and given/known data WP_20160129_12_55_19_Pro.jpg


    2. Relevant equations
    Huckel's Law: 4n+2=pi electrons

    3. The attempt at a solution
    I'm not sure what the dash and two dots in the brackets mean, are those lone pair of electrons?
    Not including them as pi electrons:
    option 1: 4= 4n+2
    n=1/2, so no aromatic
    option 2: 2= 4n+2
    n= 0, so aromatic
    option 3: 4=4n+2, n=1/2
    so the answer should be option 2?
     
  2. jcsd
  3. Jan 29, 2016 #2

    Suraj M

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    I don't know if you were told which electrons to consider when you take the value of n in huckels rule
    Does option 1 have just 4 electrons involved in the resonance?
     
  4. Jan 29, 2016 #3
    Doesn't Huckels rule involve pi electrons only? Does it involve all the electrons taking part in the resonating structures?
     
  5. Jan 29, 2016 #4

    Suraj M

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    Do you think you've considered ALL the pi electrons?
     
  6. Jan 29, 2016 #5
    Oh, but then both option 1 and 3 work out to be aromatic as both have 6 pi electrons.
     
  7. Jan 29, 2016 #6

    Suraj M

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    Is option 3 even a possible structure? Just look at it
    Count the number of electrons on each carbon!
     
  8. Jan 29, 2016 #7
    Ah, I see! Thanks.
     
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