## Strength of sigma vs pi bonds

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

Charysa Santos 4G
Posts: 107
Joined: Wed Sep 18, 2019 12:21 am

### Strength of sigma vs pi bonds

Which is stronger: a sigma or a pi bond, and why?

Christine Honda 2I
Posts: 116
Joined: Sat Sep 14, 2019 12:17 am

### Re: Strength of sigma vs pi bonds

A sigma bond is stronger. Sigma bonds result from the head-on overlap of the orbitals of the two atoms, which has more area of overlap than pi bonds which result from the parallel overlap of orbitals. That is why sigma bonds are stronger.

rabiasumar2E
Posts: 108
Joined: Thu Jul 11, 2019 12:15 am

### Re: Strength of sigma vs pi bonds

Sigma bonds are stronger than pi bonds because they overlap head on and a greater overlap = a stronger bond. Pi bonds overlap from the side therefore their bond is not as strong because the overlap is not as much.

ASetlur_1G
Posts: 101
Joined: Fri Aug 09, 2019 12:17 am

### Re: Strength of sigma vs pi bonds

In addition to overlap, the electrons in a sigma bond are directly between the 2 nuclei so the nuclei have a strong hold over the electrons. The electrons in a pi bond are further away from the nuclei, so it's easier to break a pi bond.

rohun2H
Posts: 100
Joined: Wed Sep 18, 2019 12:19 am

### Re: Strength of sigma vs pi bonds

Sigma bonds are stronger due to greater overlap end-to-end but also be sure to remember sigma bonds allow for rotation whereas pi bonds are rigid.

ShastaB4C
Posts: 100
Joined: Thu Sep 26, 2019 12:18 am

### Re: Strength of sigma vs pi bonds

So does that mean that molecules with pi bonds are more reactive?

preyasikumar_2L
Posts: 101
Joined: Fri Aug 09, 2019 12:17 am

### Re: Strength of sigma vs pi bonds

Sigma bonds are stronger because the bonding pair of electrons in sigma bonds is localised closer to the nuclei of the bonded atoms (on average). There is greater overlap.