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Q.
Which of the following compounds is aromatic?
Bihar CECEBihar CECE 2008
Solution:
is aromatic because the compound is cyclic and number of $\pi$ electrons is $2$, which is in accordance with the Huckel's rule, $(4 n+2) \pi$. When $n=0$, according to this rule, number of $\pi$ electrons is $4 \times 0+2=2$
