• # question_answer 25) What are necessary conditions for any system to be aromatic?

The necessary conditions for a system to be aromatic are: (i) Aromatic compounds are cyclic. (ii) These compounds have conjugated $\pi$-bonds. (iii) Aromatic rings are planar. (iv) According to Huckels rule, the aromatic compounds must have $(4n+2)$$\pi$ electrons in the ring system. Where n =1, 2, 3.... Example: