Which of the following compounds will show aromatic character according to $\text{Huckel}$ rule?

Solution

1. Aromatic compounds must be cyclic, planar, fully conjugated, and contain $(4n+2)\pi$ electrons.
2. Benzene has $6\pi$ electrons, which corresponds to $n=1$ in the $(4n+2)$ formula.
3. Cyclobutadiene has $4\pi$ electrons and cyclooctatetraene is non-planar.
4. Hence the answer is (C).