Question

How do we apply (4n+2)π rule except for benzene to find out which is aromatic

Answer 1

Explanation:

• when the number of its π-electrons equals 4n + 2 where n is a non-negative integer, although clearcut examples are really only established for values of n = 0 up to about n = 6.

• Criteria for simple aromatics are:
• the molecule must have 4n + 2 electrons in a conjugated system of p orbitals (usually on sp2-hybridized atoms, but sometimes sp-hybridized);
• the molecule must be (close to) planar (p orbitals must be roughly parallel and able to interact, implicit in the requirement for conjugation);
• the molecule must be cyclic (as opposed to linear);
• the molecule must have a continuous ring of p atomic orbitals (there cannot be any sp3 atoms in the ring, nor do exocyclic p orbitals count).

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