Question

Explain the term aromaticity

Answer 1

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The aromatic compounds apparently contain alternate double and single bonds in a cyclic structure, and resembles benzene in chemical behavior. They undergo substitution rather than addition reactions. This characteristic behavior is called aromaticity. AROMATICITY is in fact a property of the Sp2 hybridized planar rings with the P orbitals(one on each atom) allow cyclic delocalization of 'pi' electrons.

Rules for compounds to be aromatic:¬

1). An aromatic ring is planar and cyclic.

2). Each atom in an aromatic ring has a P orbital. These P orbitals must be parallel so that a continuous overlap is possible around the ring.

3). The cyclic Pi molecular orbital (electron cloud) formed by the overlap of P orbitals must contain (4n+2)Pi electrons.... n=0,1,2,3....known as HUCKEL RULE.


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Answer 2

the term aromaticity is used to describe a cyclic (ring-shaped), planar (flat) molecule with a ring of resonance bonds that exhibits more stability than other geometric or connective arrangements with the same set of atoms. Aromatic molecules are very stable, and do not break apart easily to react with other substances. organic compound that are not aromatic are classified as aliphatic compound—they might be cyclic, but only aromatic rings have special stability