Question -
Answer -
The necessary conditions for amolecule to be aromatic are:
· It should have a single cyclic cloudof delocalised n-electrons above and below the plane of the molecule.
· It should be planar. This is becausecomplete delocalization of n-electrons is possible only if the ring is planarto allow cyclic overlap of p-orbitals.
· It should contain Huckel number ofelectrons, i.e., (4n + 2) n-electrons where n = 0, 1, 2, 3 etc.
A molecule which does not satisfy any one or more of the above conditions issaid to be non-aromatic.