Topscore Org Question

[DonExodus]

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Which of the following is antiaromatic:
a) 1,3,5-cyclooctatriene (8 C, 3 double bonds)
b) Benzene
c) 1,3,5,7- cyclooctaquadreine? (8C, 4 double bonds)
d) Cyclobutadiene with 2 electons [Correct Answer]
e) Butadiene.

None of these are aromatic except b. Choice D has 4 electrons, is not aromatic, but what is antiaromatic, and do we need to know that for the DAT? Ive never even heard of it....

Got a 25 though 😛

 

[Notoriousjae]

None of these are aromatic except b. Choice D has 4 electrons, is not aromatic, but what is antiaromatic, and do we need to know that for the DAT? Ive never even heard of it....

Got a 25 though 😛

http://en.wikipedia.org/wiki/Antiaromatic

 

[DonExodus]

http://en.wikipedia.org/wiki/Antiaromatic

That was my first reaction, but do you think an antiaromatic question could possibly be on it???

Also, wiki makes no difference between non-aromatic and anti-aromatic.

 

[GoDucks69]

That was my first reaction, but do you think an antiaromatic question could possibly be on it???

Also, wiki makes no difference between non-aromatic and anti-aromatic.

Yeah im sure they would test on it. If it is in your ochem text and the kaplan book (which im not sure about) it can be in there. I remember it in my ochem class. Aromatic compounds are the same but instead of 4N they are 4N+2, thats the only difference I know about.

 

[allstardentist]

that IS the only difference between aromatic and antiaromatic. if a compound is neither aromatic nor antiaromatic, then it's nonaromatic.

 

[DonExodus]

Wait, so ANTIaromatic compounds are 4n? Non aromatic compounds are neither 4n+2 or 4n, and aromatics are 4n+2?

Antiaromatic wasnt in my textbook, and I dont remember it from the classes either 😉

 

[GoDucks69]

Wait, so ANTIaromatic compounds are 4n? Non aromatic compounds are neither 4n+2 or 4n, and aromatics are 4n+2?

Antiaromatic wasnt in my textbook, and I dont remember it from the classes either 😉

Aromatic is a cyclic, conjugated, and 4N+2
Antiaromatic is cyclic, conjugated and 4N
Non aromatic is anything else

 

[Notoriousjae]

Wait, so ANTIaromatic compounds are 4n? Non aromatic compounds are neither 4n+2 or 4n, and aromatics are 4n+2?

Antiaromatic wasnt in my textbook, and I dont remember it from the classes either 😉

A compound is anti aromatic if it fulfills the following conditions: It has to be cyclic, planar and have an even pair of pie electrons.
A compound is aromatic if it is cyclic, planar and has an odd pair of pie electrons
A compound that is neither aromatic or anti aromatic is non aromatic.
and yes anti aromaticity is an important concept