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Longer bonds are weaker and shorter bonds are stronger. Single bonds are the longest so they are the weakest; triple bonds are the shortest so they are the strongest. Double bonds are in the middle with both length and strength.
In some compounds (such as water), molecules are attracted to each other with London dispersion forces, meaning that the electrons in the valence shell of the compound are attracted to the nuclei of the atoms of the other molecule. These forces are some of the weakest out of all of the bonding forces because no real bonds are actually formed.
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