Bond energy of a Pi bond and a sigma bond

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Discussion Overview

The discussion revolves around the bond energy of sigma and pi bonds, specifically comparing the bond energies of C=O and C-O bonds. Participants explore the implications of bond energy values and the strength of different types of bonds in the context of hybridization.

Discussion Character

  • Debate/contested
  • Technical explanation

Main Points Raised

  • One participant asserts that the bond energy table indicates a pi bond energy of 387 KJ, suggesting it is stronger than the sigma bond energy of 358 KJ, which raises a question about the validity of this interpretation.
  • Another participant points out that the comparison may be flawed, as it involves different hybridization states (sp3 for C-O and sp2 for C=O), implying that the comparison is not valid.
  • A later reply acknowledges the educational aspect of the discussion without adding further claims.
  • Another participant notes that the C=O bond is shorter, which may imply additional factors affecting bond strength.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the strength comparison between sigma and pi bonds, and multiple competing views remain regarding the interpretation of bond energies and hybridization effects.

Contextual Notes

The discussion highlights potential limitations in comparing bond energies due to differences in hybridization and the implications of bond length on bond strength, which remain unresolved.

r12214001
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bond energy
It is well known that sigma bond is stronger than Pi bond. However in bond energy table that C=O is 745 KJ and C-O is 358 KJ. we can calculate the Pi bond energy is 745-358=387! The Pi bond(387KJ) is stronger than sigma bond(358KJ) ? How could this happen?
 
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r12214001 said:
Summary: bond energy

It is well known that sigma bond is stronger than Pi bond. However in bond energy table that C=O is 745 KJ and C-O is 358 KJ. we can calculate the Pi bond energy is 745-358=387! The Pi bond(387KJ) is stronger than sigma bond(358KJ) ? How could this happen?
In this case, your table lists the sp3 hybridized sigma carbon-oxygen strength ( C-O) rather than the sp2 hybridized sigma carbon-oxygen strength (C=O). Comparing apples and oranges...
 
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thanks for your education
 
... and the CO bond is shorter.
 
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