question_answer

Which of the following compounds is not aromatic?

A)                     

B)  

C)                                 

D)  

Correct Answer: C

Solution :

                According to Huckel rule an aromatic compound has\[(4n+2)\pi \]electrons, where \[n=0,\text{ }1,\text{ }2,\text{ }3...\]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