Which one of the following compound is aromatic?

Question

Quizplus · Accepted Answer

In order to determine if a compound is aromatic, we must follow Hückel's rule, which states that a compound is aromatic if it follows the following criteria:
1. It is cyclic
2. It is planar
3. It has a continuous system of overlapping p-orbitals
4. It follows the 4n+2 rule, where n is a non-negative integer.

Out of the given compounds, only compound III (benzene) follows all of these criteria and thus is aromatic. Compound I is not cyclic, compound II is not planar, and compound IV has too many pi electrons to follow the 4n+2 rule.

Which One of the Following Compound Is Aromatic