question_answer

Among the following, the aromatic compound is

A)                                

B)  

C)                    

D)  

Correct Answer: A

Solution :

                According to Huckels rule for aromaticity, the aromatic molecule must be planar, cyclic system having delocalised \[(4n+2)\]\[\pi \]electrons where, n is an integer, i.e., 0, 1, 2, 3, .... Thus, aromatic compounds must have 2, 6, 10 or \[14\pi \]-electrons. Cyclopropenyl cation has \[2\pi \]-electrons \[(n=0)\], hence it is aromatic compound.