Bond energy of a Pi bond and a sigma bond

In summary, the bond energy table shows that the Pi bond strength between C=O is 387 KJ, which is stronger than the sigma bond strength of 358 KJ between C-O. This may seem contradictory, but it is due to the different hybridization states and bond lengths of the two bonds.
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r12214001
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TL;DR 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?
 
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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
 
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... and the CO bond is shorter.
 
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1. What is the difference between a Pi bond and a sigma bond?

A Pi bond is a type of covalent bond formed by the sideways overlap of atomic orbitals, while a sigma bond is formed by the head-on overlap of atomic orbitals. Pi bonds are weaker than sigma bonds due to the smaller overlap of orbitals.

2. How is the bond energy of a Pi bond and a sigma bond determined?

The bond energy of a Pi bond and a sigma bond is determined by the strength of the bond between the two atoms. This strength is influenced by factors such as the types of atoms involved, the distance between them, and the number of bonds present.

3. Can the bond energy of a Pi bond and a sigma bond be affected by external factors?

Yes, the bond energy of a Pi bond and a sigma bond can be affected by external factors such as temperature, pressure, and the presence of other molecules. These factors can alter the strength of the bond and thus affect the bond energy.

4. How does the bond energy of a Pi bond and a sigma bond affect the stability of a molecule?

The bond energy of a Pi bond and a sigma bond contributes to the overall stability of a molecule. The stronger the bond, the more stable the molecule will be. This is because stronger bonds require more energy to break, making it less likely for the molecule to undergo chemical reactions.

5. Are Pi bonds or sigma bonds more reactive?

Pi bonds are generally more reactive than sigma bonds. This is because the sideways overlap of Pi bonds allows for easier rotation and breaking of the bond, making it more susceptible to chemical reactions. Sigma bonds, on the other hand, have a stronger head-on overlap and are less likely to undergo reactions.

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