question_answer

Which of the following compounds is not aromatic?                           

A)  

B)  

C)  

D)  

Correct Answer: C

Solution :

 According to Huckel?s rule an aromatic compound has \[(4n+2)\pi \] 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