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OC Destroyer problem #17 tautomers & constitutional isomerism

Bobby Fischer

Full Member
Jun 15, 2011
482
17
    The answer states, "This pair represents tautomers, which are simply constitutional isomers that co-exist in rapid equilibrium..."

    Wait, whaa?? I thought to be a constitutional isomer that you need to have the same molecular formula (just different connectivity)?

    Sure, tautomers are the keto and enol forms but the enol form has a Hydrogen atom that the keto does not.

    How can the keto and enol forms be consitutional isomers?
     

    Kingsta2426

    Full Member
    Jan 12, 2012
    248
    0
    1. Pre-Dental
      The answer states, "This pair represents tautomers, which are simply constitutional isomers that co-exist in rapid equilibrium..."

      Wait, whaa?? I thought to be a constitutional isomer that you need to have the same molecular formula (just different connectivity)?

      Sure, tautomers are the keto and enol forms but the enol form has a Hydrogen atom that the keto does not.

      How can the keto and enol forms be consitutional isomers?

      Because they have the same chemical formula, I'm pretty sure all tautomers are constitutional isomers.
       
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      Bobby Fischer

      Full Member
      Jun 15, 2011
      482
      17
        I feel pretty stupid right about now guys and gals.

        Sorry about that. Duh. Yeah, when I actually stop and think about it long enough to count up the hydrogens, totally the same molecular formula.

        Thanks for the replies.

        I never formally learned this nor did I stop until now to really think about it. Now I hope I get questioned about this on the exam.:thumbup:
         
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