question_answer

Which of the following compounds is not aromatic?

A)                   

B)  

C)                    

D)  

Correct Answer: C

Solution :

                According to Huckels rule an aromatic compound has\[\left( 4n+2 \right)\pi \]electrons, where n = 0, 1, 2, 3,...... etc.  ; \[4n+2=2\,;\]\[n=0\,;\]aromatic  ; \[4n+2=6\,;\]\[n=1\,;\]aromatic  ; \[4n+2=4\,;\]\[n=0.5\,;\]non-aromatic  ; \[4n+2=6\,;\]\[n=1\,;\]aromatic