How to Determine the Number of Pi Bonds in a Molecule Using the MO Model?

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Discussion Overview

The discussion revolves around determining the number of pi bonds in a molecule using the Molecular Orbital (MO) model. Participants explore the relationship between hybridization and the formation of pi bonds, as well as the implications of bond types in molecular structures.

Discussion Character

  • Homework-related
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant states that the number of pi bonds is equal to 3 minus the "power" of p from hybridized bonds, questioning why certain atoms are not considered in the calculation.
  • Another participant clarifies that each single bond has one sigma bond, while each double bond has one sigma and one pi bond.
  • A participant asks whether the number of pi bonds is independent of the degree of hybridization.
  • A later reply suggests that while pi bonds generally require unhybridized p-orbitals, the number of such orbitals does not directly indicate the number of pi bonds, proposing that counting double and triple bonds is a simpler method.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between hybridization and pi bonds, with some suggesting a direct correlation while others argue for a more nuanced understanding. The discussion remains unresolved regarding the exact nature of this relationship.

Contextual Notes

Participants have not fully addressed the assumptions related to hybridization and its impact on pi bond formation, and there are unresolved mathematical steps in the initial claims regarding the calculation of pi bonds.

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Homework Statement


HunOeH0.png

http://i.imgur.com/HunOeH0.png

Homework Equations


MO model

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!
 
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Each single bond consists of one sigma bond. Each double bond consists of one sigma bond and one pi bond.
 
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Does that means the number of pi bond is independent to degree of hybridization?
Thanks!
 
yecko said:
Does that means the number of pi bond is independent to degree of hybridization?
Thanks!
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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