## Sigma bonds

$sp, sp^{2}, sp^{3}, dsp^{3}, d^{2}sp^{3}$

Shundeen Martinez 1D
Posts: 31
Joined: Fri Sep 28, 2018 12:18 am

### Sigma bonds

Why can there be multiple pi bonds but only one sigma bond?

Porus_Karwa_2E
Posts: 72
Joined: Fri Sep 28, 2018 12:24 am

### Re: Sigma bonds

3 pi bonds and 1 sigma bond means its a quadruple bond.

Tessa Lawler 1A
Posts: 57
Joined: Fri Sep 28, 2018 12:18 am

### Re: Sigma bonds

I know that when you have a multiple bond like a double or a triple bond, only the first one is a sigma, and all the others are pi bonds. E.g. a triple bond contains one sigma and two pi bonds. But I'm not sure why that is the case structurally.

KatrinaPho_2I
Posts: 60
Joined: Fri Sep 28, 2018 12:28 am

### Re: Sigma bonds

All first bonds are sigma bonds. Any of the bonds on top of the first are considered pi bonds.

Posts: 30
Joined: Fri Sep 28, 2018 12:26 am

### Re: Sigma bonds

The first bond between is always a sigma bond, every additonal bondage (i.e. double, triple bond ) is a pi bond. Therefore a single bond is a sigma bond, but a double bond has one sigma bond and one pi bond, and a triple bond has one sigma bond and 2 pi bonds.

marg44
Posts: 18
Joined: Fri Sep 28, 2018 12:24 am
Been upvoted: 1 time

### Re: Sigma bonds

For these sigma and pi bonds, is one bond stronger than the other? Or are they of equal strength?

Kelsey Li 3B
Posts: 34
Joined: Fri Sep 28, 2018 12:26 am

### Re: Sigma bonds

Every bond in a molecule is considered a sigma bond. But bonds on top of those are considered pi bonds.

Grace Diaz 3F
Posts: 30
Joined: Fri Sep 28, 2018 12:24 am

### Re: Sigma bonds

Sigma bonds are always single bonds, or the first bonds in a double or triple bond. The remaining bonds of a double or triple bonds are pi bonds. This is easy to visualize when looking at hybridized orbitals. The hybridized sp orbitals form sigma bonds while the unhybridized p orbitals form pi bonds

Ethan Yi 1K
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

### Re: Sigma bonds

marg44 wrote:For these sigma and pi bonds, is one bond stronger than the other? Or are they of equal strength?

i think a sigma bond alone is stronger than a pi bond would be alone, but a pi bond is never alone, it's always on top of a sigma bond

Shibhon_Shepard
Posts: 62
Joined: Wed Nov 15, 2017 3:04 am

### Re: Sigma bonds

marg44 wrote:For these sigma and pi bonds, is one bond stronger than the other? Or are they of equal strength?

Sigma bonds are stronger and pi bonds are weaker.