What are the necessary conditions for any system to be an aromatic? 

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 The molecule should contain cyclic cloud of delocalized electrons above and below the plane of the molecule. 

 For the delocalization of pi electrons the ring must be planer to allow cyclic overlap of p-orbitals. 

 It should contain (4n+2) π electrons where n = 0, 1, 2, 3… This is known as Huckel rule. 

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