Over the course of the semester, we have run the whole gamut of electronic consi

Question

Over the course of the semester, we have run the whole gamut of electronic considerations with respect to reactions, as well as kinetic v. thermodynamic control The electronic structures of highly conjugated systems and (anti)aromatic systems Very neatly ties these things together. a. Provide a chemically sound definition of conjugation. b. Provide a chemically sound definition of aromaticity. c. Anti aromaticity is considered the polar opposite of aromaticity. What makes an panchromatic system so unstable?

Explanation / Answer

In case of aromatic system all the delocalised electrons are present in bonding molecular orbital so the delocalisation takes place in bonding molecular orbital hence it leads to extra stability.

While in case of anti aromatic system some of the electrons to be delocalised are present inantibondin molecular orbital hence the delocalisation leads to instability

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