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A sigma bond is in direction along the bond axis, like a stick connecting two balls, so atoms can rotate freely. The pi bonds is formed above and below the sigma bond, so it is only stable in one orientation and cannot rotate.
a sigma bond can rotate because it is connected at one point so the atoms can rotate freely, in a double or triple bond (containing a sigma and pi bonds) there are connections at either 3 or 5 points and so if it was to rotate, it would need to break the bonds at those points and reform them at the new points, which is just not going to happen by itself.
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