what's the difference between anti-aromatic and non aromatic compounds?

Answer 1

Aromatic - delocalisation leaves you with lower energy than you would expect just from the sum of single and double bond strengths. Works for conjugated ring system with 4n + 2 pi- electrons (benzene, 6; naphthalene, 10)

Antiaromatic; this happens with conjugated ring systems with 4n pi-electrons. If you do the molecular orbital theory for these, you find that the bonding energy is less than predicted just from single and double bond energies, and that te lowest energy electrons are often in a degenerate orbital, implying either distortion or paramagnetism.

Cyclobutadiene is a famous example of antiaromatic character. There is a nice article about it in Wikipedia. It can be stabilized in transition metal complexes, but then itbecomes much less clear how many electrons still "belong" to the ring.

Non-aromatic: everything else.

Note: sometimes (as in thiophene) pi lone pairs can stand in for the pi electrons of double bonds.

Answer 2

Aromatic Vs Antiaromatic

Answer 3

This is often a difficult question to answer exactly. So aromatic contain 2, 6, 10, 14, etc pi electrons in a planar ring in which resonance structures can be drawn to all atoms.

Anti-aromatic are similar to aromatic with 4, 8, 12, etc pi electrons ...

Non-aromatic are more stable than anti-aromatic compounds and so many compounds that might appear to be anti-aromatic are non-aromatic. A good example is 1,3,5,7-cyclooctatetraene. It has 8 pi electrons in an alternating fashion in a ring in which a resonance structure could be drawn to the alternate atoms. However, the structure adopts a puckered shape so the pi electrons do not interact. Therefore, rather than being anti-aromatic, it is in fact non-aromatic.

One must pay careful attention to heteroatoms as they sometimes contribute to an aromatic ring to make it aromatic as in furan, while in others, the electrons are perpendicular to the resonating pi electrons as in pyridine. Pyridine while it contains 8 pi electrons, only 6 are involved in making the ring aromatic. Furan also has 8 pi electrons. The oxygen contributes 2 to making the ring aromatic and the other 2 are orthogonal to it.

Answer 4

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First, you can determine whether or not the molecule is non-aromatic. It is non-aromatic if it breaks one of the following rules. If the molecule follows all of the following rules, it is either aromatic or anti-aromatic. 1. It must have an uninterrupted cyclic cloud of pi electron on the plane of molecule. To do this, it must have alternating single and double bonds (or also lone pairs that can "jump in" to sort of replace a double bond), which can easily be seen in a benzene ring. 2. The molecule must be cyclic. 3. The molecule must be planar (an 8-Carbon ring is not planar, for example) If the molecule meets all of these requirements, it is either aromatic or anti-aromatic. If it does not follow all or any of the rules, it is non-aromatic. To distinguish between aromatic and anti-aromatic, the molecule must meet Huckle's Rule. It must have 4n + 2 pi electrons (in the planar, cyclic part of the molecule). A double bond has two pi electrons and a lone pair also has two pi electrons. The n in 4n + 2 must be an integer.

Answer 5

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RE:
what's the difference between anti-aromatic and non aromatic compounds?

Answer 6

1.cyclic and planar
2.sp2 or so hybridised
3.conjugation
4.continuous delocalisation of p electrons
5.huckel's rule
If 1,2,3,4,5 are satisfied then it is aromatic compound.
If 1,2,3,4 and has 4np electrons where nn is whole number then it is anti aromatic compound.
If any of1,2,3,4 are not followed then it is non aromatic compound.

Answer 7

I believe an anti-aromatic compound is one that should, from its p-orbitals be as stable as benzene, but is actually not as stable as it would be predicted, or another way to see this is that it has alternating double bonds in a ring. A non-aromatic compound is either an open chain molecule, or one that does not have alternating double bonds.

Answer 8

Aromatic compounds are those that have (4n + 2) pi electrons within them. e.g. Benzene has 6 pi electrons, therefore n=1 for benzene.

Some molecules can be anti-aromatic in which case they just have 4n pi electrons.

If a molecule is neither it is simply (non-aromatic)

Answer 9

Antiaromatic

Answer 10

non aromatic meaning that they have no scent, like water

anti aromatic, could be two things: compounds that nullifies other odors; or compounds that saturates / nullifies smelling terminals and rendered incapable of perceive scents, mostly for a short period of time, like deodorizer sprays, gun powder, etc