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Sigma bonds can rotate. Pi bonds can not rotate because they arise from the unhybridized p orbitals, and because of their shape they must be in the same orientation, thus restricting a rotational ability or else the bond will be broken.
No, electrons do not attract each other as they are the same charge. Pi bonds occur when electrons are shared through side-by-side orbital overlap rather than by end-to-end orbital overlap, which results in sigma bonding instead.
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