Question

Write short note on "Application of Huckel's rule-aromatic ions".​

Answer 1

Answer:

In order to be aromatic, a molecule must have a certain number of pi electrons within a closed loop of parallel, adjacent p orbitals. The pi-electron count is defined by the series of numbers generated from 4n+2 where n = zero or any positive integer (i.e., n = 0, 1, 2, etc.). This rule is known as Huckel's rule.

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Answer 2

Application of Huckel's rule-aromatic ions are as follows:-

• Any planar, cyclic system containing 2, 4, 6, 10, 14...i.e. (4n +2π) electrons and having cyclic π-electron cloud is aromatic.
• Huckle's rule can explain the aromaticity of monocyclic systems. For instance, cyclopropenyl ion, cyclopentadienyl ion are aromatic.
• It can also explain the aromaticity of polycyclic compounds like naphthalene, anthracene, and phenanthrene (all three are aromatic in nature)
• The aromatic nature of heterocyclic compounds like pyridine, furan, pyrrole, etc can also be predicted using this rule.