question_answer

Which of the following compounds is aromatic?

A)   

B)   

C)   

D)   

Correct Answer: D

Solution :

is aromatic because the compound is cyclic and number of k electrons is 2, which is in accordance with the Huckels rule, \[(4n+2)\,\pi \]. When \[n=0\], according to this rule, number of \[\pi \] electrons is \[4\times 0+2=2\]