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Number of pi bonds

  1. May 12, 2017 #1

    yecko

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    1. The problem statement, all variables and given/known data
    HunOeH0.png
    http://i.imgur.com/HunOeH0.png

    2. Relevant equations
    MO model

    3. The attempt at a solution
    as far as i know, number of pi bond is equal to 3 - the "power" of p (the hybridized bond formed)
    the answer "4" is only calculated from the 4 elements' bond in part b, so why the central O and C atom is not considered with calculation of pi bond? Thanks!
     
  2. jcsd
  3. May 12, 2017 #2

    Ygggdrasil

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    Each single bond consists of one sigma bond. Each double bond consists of one sigma bond and one pi bond.
     
  4. May 13, 2017 #3

    yecko

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    Does that means the number of pi bond is independent to degree of hybridization?
    Thanks!
     
  5. May 14, 2017 #4

    Ygggdrasil

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    They are not independent as you generally need an unhybridized p-orbital to form a pi bond, but the number of unhybridized p-orbitals will not always be indicative of the number of pi bonds. It's much easier to simply count the number of double and triple bonds shown in the molecule.
     
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