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

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A compound is said to be aromatic if it satisfies the following three conditions: 

(i) It should have a planar structure. 

(ii) The π–electrons of the compound are completely delocalized in the ring. 

(iii) The total number of π–electrons present in the ring should be equal to (4n + 2), where n = 0, 1, 2 … etc. This is known as Huckel’s rule. 

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