Which of the following structures is aromatic?

Question

Quizplus · Accepted Answer

The criteria for a molecule to be aromatic is that it must be cyclic, planar, conjugated, and follow Huckel's rule (4n+2 pi electrons, where n is a non-negative integer).

Option I is cyclic, planar, and conjugated, but it has 6 pi electrons, which does not follow Huckel's rule.
Option II is cyclic, planar, and conjugated. It has 6 pi electrons which also does not follow Huckel's rule.
Option III is cyclic, planar, and conjugated. It has 10 pi electrons which follows Huckel's rule.
Option IV is cyclic, planar, and conjugated. It has 8 pi electrons which does not follow Huckel's rule.
Option V is not cyclic, so it cannot be aromatic.

Therefore, the structures that meet the criteria for being aromatic are I, III, and IV. Hence, the correct answer is B.

Which of the Following Structures Is Aromatic