Question

What is meant by aromaticity or.aromatic character? State three rules of aromaticity​

Answer 1

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The property is common to all aromatic compounds and is referred to as aromaticity or aromatic character. The aromatic character of benzene is correlated to its structure, Aromaticity is due to extensive cyclic delocalization of p-electrons in planar ring structures

The three rules of aromaticity are useful in predicting whether a particular compound is aromatic or non-aromatic.

• (1) Aromatic compounds are cyclic and planar (all atoms in ring are sp^2 hybridized.)
• (2) Each atom in aromatic ring has a p-orbital. The p-orbitals must be parallel so that continuous overlap is possible around the ring
• (3) The cyclic molecular orbital formed by overlap of p-orbitals must contain (4n+2) p electrons, where n integer 0, 1, 2, 3, etc

Answer 2

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The cyclic carbon compounds which contain atleast one benzene nucleus in their structure or have benzenoid structure are called as aromatic compounds.

and this property is called as aromaticity or aromatic character.

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The three rules of aromaticity are :

• The molecule should be planar.

• The molecule should be cyclic with alternate single and double bonds i.e, there is complete delocalization of the π electrons in the ring.

• The molecule should contain ( 4n + 2 ) π electron, where n = 1, 2, 3, etc ( Huckels rule).

A molecule which does not satisfy any more or more of the above mentioned conditions is said to be non-aromatic.

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