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Homework Help: Why does oxygen carry the positive F.C in [CH3OH2]+?

  1. Feb 10, 2017 #1
    1. The problem statement, all variables and given/known data
    Find the lewis structure for [CH3OH2]+

    2. Relevant equations
    n/a

    3. The attempt at a solution
    I found the lewis structure to have a positive formal charge on the oxygen. I'm not sure why the oxygen would have the + f.c. since it is much more electronegative than fairly neutral carbon. I initially wanted carbon to have an incomplete octet, so it would carry the + charge, but that did not work.
     
  2. jcsd
  3. Feb 10, 2017 #2
    I just looked up the electronegativity difference (Pauling scale) for Carbon and oxygen=0.9

    So... this would be a polar covalent bond.

    However, basic lewis structure rules say that the most electronegative atom should carry the negative formal charge. Right?
     
  4. Feb 11, 2017 #3

    Borek

    User Avatar

    Staff: Mentor

    Start with CH3OH, then look for a lone pair which can hold H+.
     
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