First slide
Arenes
Question

How many of the following compounds are aromatic according to Huckel’s rule?

Moderate
Solution

[Step 1]:
Huckel rule: Presence of ( 4n + 2 ) π – electrons in the ring where n is an integer  (n=0,1,2,…)
[Step 2]:

 

 contain 6 π and 10 π electrons according to Huckel rule. Therefore,  these two are aromatic.
[Step 3]:

 


and contain 4 π, electrons and are not aromatic.

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