double bonds
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double bonds
how do we differentiate which bond is the sigma and which is the pi bond in a double bond?
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Re: double bonds
It is arbitrary, meaning that either one of the two could be the sigma bond and the other is then the pi bond. It is your choice to decide which is which, but you should clearly distinguish between the two when necessary.
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Re: double bonds
It doesn't necessarily matter. Either can be sigma or pi. Drawing them, just know one is each. You don't need to know which is sigma or pi.
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Re: double bonds
The best way to determine this is by remembering that the sigma bond is always the first bond that is formed between two atoms and the pi bonds is always the second. Therefore, when a double bond is broken, the first bond that is broken between the two will be the pi bond. Hope that helps!
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Re: double bonds
A quick way to think about it is when you see a single bond or any type of bond really, see it as there is a sigma bond there. When you see a double or triple bond this means that there are pi bonds present. Single bonds have one sigma bond. double bonds have a sigma and pi bond. triple bonds have one sigma bond and two pi bonds.
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Re: double bonds
Always remember that the sigma bond is the first link formed between two atoms, and the pi bond is the second. As a result, when a double bond is broken, the pi bond is the first to be broken between the two!
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Re: double bonds
The sigma bond will have been the first one formed and will involve end-to-end bonding of orbitals. The pi bonds will form subsequently, and are side-by-side bonds that do not allow for rotation. Hope this helps!
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Re: double bonds
Both are present, and I believe we just have to understand that conceptually and not be able to identify which is which.
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Re: double bonds
The first bond broken is the pi bond. Also in hybridization, the set of electrons in the p orbital can be characterized as the pi bond!
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Re: double bonds
Hi Tiyana!
We don't know which bond is the sigma and which is the pi bond in a double bond, just that there is one of each.
We don't know which bond is the sigma and which is the pi bond in a double bond, just that there is one of each.
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Re: double bonds
In a double bond there is one sigma bond and one pi bond. The sigma bond is the direct sharing of electrons in the molecule, while the pi bond is delocalized.
Re: double bonds
The first bond is essentially always a sigma bond, and the second one that forms (if a double bond is occurring) is the pi bond. It is probably more helpful just to know that a double bond possesses one sigma and one pi bond, as I feel like when you draw them out you wouldn't really be able to distinguish them (unless in like an ochem kind of way).
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Re: double bonds
All the first bonds are sigma, and double bonds if there are any are pi. Pi are rigid and do not allow for rotation of the molecule, unlike sigma bonds!
Re: double bonds
I don't believe that there is a specific bond in a lewis structure or other diagram that you can differentiate , but I usually make sure to indicate the sigma bonds first.
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