# Do all sigma bonds are stronger than pi bonds? [closed]

Many textbooks refer that sigma bonds are stronger than pi bonds . But each individual bond ( between different atoms) have different bond energy. So how we know for sure that every possible sigma bond is stronger than every possible pi bond ?

## closed as too broad by Mithoron, A.K., Waylander, Jon Custer, TyberiusOct 31 '18 at 18:26

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• That's because, typically, these textbooks are comparing X–Y sigma bonds with X–Y pi bonds. Otherwise, as you say, it doesn't make much sense to compare them. – orthocresol Oct 30 '18 at 22:45

From this table at Wikipedia, we can see that the bond dissociation energy for the F-F bond in $$\ce{F2}$$ is 157 kj/mol. Meanwhile, the bond dissociation energy for the C-C bond in ethane $$\ce{H3C-CH3}$$ is on the order of 360 kJ/mol. The bond dissociation energy of the C=C bond in ethene $$\ce{H2C=CH2}$$ is approximately 710 kJ/mol. The note for this compounds suggests that the pi bond is around 270 kJ/mol (65 kcal/mol), leaving the sigma bond at 440 kJ/mol. Thus, the carbon-carbon pi bond is stronger than the fluorine-fluorine sigma bond.