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sigma and pi bonds do not effect the lewis structure; however, they do effect how the molecule is shaped and how its shape can change because sigma bonds allow for more rotations and movement of the molecules whereas pi bonds do not allow for this full range of motion.
Technically, sigma and pi bonds do affect bond length and bond angles. However, the change is minimal so it therefore doesn't have much influence on the molecular shape. Furthermore, the VSEPR model counts single, double, and triple bonds as one region.
SVajragiri_1G wrote:No, sigma and pi bonds do not influence a molecule's shape (in other words, the type of bond doesn't affect the shape).
It is important to note, however, that pi bonds cannot rotate. This means that having pi bonds (double and triple bonds), can prevent the molecule from rotating which can impact how flexible a molecule is.
No the sigma and Pie bonds do not affect the molecular shape of a molecule, only the lone pairs do and the amount of bonds present. They do however affect whether certain atoms will be on the same plane. For example any atom connected to a double or triple bond will be in the same plane because pie bonds cannot rotate unlike sigma bonds.
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