question_answer

Among the following the aromatic compound is:

A)                        

B)  

C)                          

D)  

Correct Answer: A

Solution :

[a]   It has \[2\pi \] electrons and hence is aromatic. While all others have\[4\pi \]-electrons and hence are ant aromatic. For a molecule to be aromatic, the necessary conditions are: It should have single cyclic cloud of delocalized \[\pi \]- electrons above and below the plane of the molecule. It should be planar It should contain (4n + 2) n electrons                         Where n = 0,1, 2, 3 etc.