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A sigma bond is stronger. Sigma bonds result from the head-on overlap of the orbitals of the two atoms, which has more area of overlap than pi bonds which result from the parallel overlap of orbitals. That is why sigma bonds are stronger.
Sigma bonds are stronger than pi bonds because they overlap head on and a greater overlap = a stronger bond. Pi bonds overlap from the side therefore their bond is not as strong because the overlap is not as much.
In addition to overlap, the electrons in a sigma bond are directly between the 2 nuclei so the nuclei have a strong hold over the electrons. The electrons in a pi bond are further away from the nuclei, so it's easier to break a pi bond.
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