pi orbital

[mindblowing]

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how many pi molecular orbital present in pyridine?
3
4
5
6
7

can some explain?

 

[vvvv]

how many pi molecular orbital present in pyridine?
3
4
5
6
7

can some explain?

I would say 7.

 

[mindblowing]

its rt but how?

 

[phungy]

5 from the 5 carbons, 1 from the nitrogen and 1 from the lone pair on the nitrogen = 7.

 

[TheGreenWave]

5 from the 5 carbons, 1 from the nitrogen and 1 from the lone pair on the nitrogen = 7.

i would guess either 6 or 7. im curious, since the nitrogen lone pair isnt delocalized in the aromatic ring, would they still occupy a pi orbital?? I can see the six pi orbitals from the three double bonds, im just not sure about the lone pair...

 

[Hugh Mannity]

I would say 6 because it is aromatic, and aromatic's have 4n+2 pi electrons (6 in this case)

 

[phungy]

i would guess either 6 or 7. im curious, since the nitrogen lone pair isnt delocalized in the aromatic ring, would they still occupy a pi orbital?? I can see the six pi orbitals from the three double bonds, im just not sure about the lone pair...

I thought 6 as well but OP says its 7 so I assumed the lone pairs on the Nitrogen would contribute to pi molecular orbitals -shrugs-

 

[Hugh Mannity]

Well I'll just have to completely disagree with the OP then because the lone pair isn't a part of the conj. pi system. It is just like benzene but has a basic lone pair (since it's not part of the pi system) instead of a C-H like in benzene.

 

[250rsavage]

http://forums.studentdoctor.net/showthread.php?t=529760&highlight=huckel

this is a good tread to figure out pi orbitals and if it is aromatic or not.

Pyridine is aromatic so it has to be 6