pi bonds

[606012329]

I understand that pi bonds dont allow a molecule to rotate but why is this important? what does a molecule being able to rotate allow it to do in comparison to it not being able to rotate?

[205873468]

Molecules with pi bonds can not rotate because of the location at which they are connected to. These are connected side by side, if the molecule were to rotate about its axis, the pi bond between would break. The molecular rotation of a molecule depends on its inertia and kinetic energy. A molecule that rotates is useful because at any angle that you view it at, you can accurately draw the molecule and it will look the same at all angles. Whereas molecules connected by pi bonds can only be viewed/seen at a certain angle due to their inability to rotate.

[Hansika_Sakshi_2k]

This is important because if they did rotate, they would break the bond and parallel orientation.

[Valeria Perez 3J]

In addition to what the others have already mentioned, the ability of a bond to rotate allows for the molecule to form different types of bonds, if possible, whereas pi bonds that limit rotation also limit the number of orientations of the atoms that can create bonds with other molecules. An example of this would be chelating agents that are able to rotate to surround the metal ion, versus the inability to rotate may limit its ability to do so. Hope that helps!

[Valeria Perez 3J]

In addition to what the others have already mentioned, the ability of a bond to rotate allows for the molecule to form different types of bonds, if possible, whereas pi bonds that limit rotation also limit the number of orientations of the atoms that can create bonds with other molecules. An example of this would be chelating agents that are able to rotate to surround the metal ion, versus the inability to rotate may limit its ability to do so. Hope that helps!