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Sigma bonds allow for the molecule to rotate while pi bonds don't allow it to rotate because they are side by side. Like Lavelle showed in class, if you put 3 EXPO markers in between your two pointer fingers and twist, two markers would fall (pi) while one marker remains in place (sigma).
Sigma and pi bonds are chemical covalent bonds formed by an overlap in atomic orbitals. These bonds are important because knowing if a bond has sigma, pi, or both bonds helps us determine behavior of molecules in molecular orbital theory.
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