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pi-bonds

Posted: Sun Nov 25, 2018 11:05 pm
by akroberts
How can we recognize when a pi-bond is formed?

Re: pi-bonds

Posted: Sun Nov 25, 2018 11:20 pm
by rikolivares
When there is more than a single bond.

Re: pi-bonds

Posted: Sun Nov 25, 2018 11:40 pm
by 305117729
pi bond is formed by overlapping between p orbitals, or say parallel interactions between p orbitals. So it will only be formed when two atoms with their p orbitals overlapping, and it means that only when a double or triple bond formed, pi bonds will be formed, since the s orbitals form the single bond, namely sigma bond.

Re: pi-bonds

Posted: Sun Nov 25, 2018 11:54 pm
by duverge_maciel
Why do pi bonds not allow bound atoms to rotate?

Re: pi-bonds

Posted: Sun Nov 25, 2018 11:58 pm
by Angel Chen 2k
Basically, a pair of double bonds consists of one sigma bond and a pi bond. Triples bonds contain one sigma bond and two pi bonds.

Hope this helps!

Re: pi-bonds

Posted: Mon Nov 26, 2018 12:06 am
by Sydney Aurelio_Dis4B
duverge_maciel wrote:Why do pi bonds not allow bound atoms to rotate?

Pi bonds do not allow bound atoms to rotate because rotating the atoms weakens the pi bonds. Pi bonds are the strongest when the p orbitals between atoms are parallel.

Re: pi-bonds

Posted: Mon Nov 26, 2018 1:13 am
by Josceline 3J
You could think of it as the second bond that is made. The sigma is the first bond (electrons are taken from the center, C--O ). The pi is formed by taking electrons from around the atom to create bonds. I'm not sure if it makes sense unless you see it, at least that's how they showed me.

Re: pi-bonds

Posted: Mon Nov 26, 2018 1:56 am
by 505194972 3k
duverge_maciel wrote:Why do pi bonds not allow bound atoms to rotate?

Professor Lavelle gave a very good example in lecture when he held two pencils parallel between his two hands and when he twisted them the pencils fell. if the atom rotated the bonds would break. I believe the pi bond stabilizes the molecule.