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

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SUMMARY

The discussion focuses on determining the number of pi bonds in a molecule using the Molecular Orbital (MO) model. It establishes that the number of pi bonds is directly related to the presence of double and triple bonds, rather than solely relying on the degree of hybridization. Specifically, each double bond contributes one pi bond, while triple bonds contribute two. The central atoms, such as oxygen and carbon, must be considered in the overall bond count to accurately assess the number of pi bonds present.

PREREQUISITES
  • Understanding of the Molecular Orbital (MO) model
  • Knowledge of hybridization concepts
  • Familiarity with sigma and pi bond definitions
  • Ability to identify double and triple bonds in molecular structures
NEXT STEPS
  • Study the relationship between hybridization and bond types in organic chemistry
  • Learn to identify and count pi bonds in complex molecular structures
  • Explore the implications of unhybridized p-orbitals in bond formation
  • Review examples of molecules with varying degrees of hybridization and their corresponding bond types
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Chemistry students, organic chemists, and educators seeking to deepen their understanding of molecular bonding and the MO model.

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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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