Chapter 13, Problem 13.64QP

Interpretation Introduction

Interpretation: An explanation corresponding to the fact that the given molecules are not considered as aromatic molecules is to be stated.

Concept introduction: The aromatic compounds must have cyclic and planar structure. The pi network of aromatic compounds must contain $\text{4n}+2$ electrons, so that delocalization of the $\text{π}$ electrons can take place resulting in lowering the electronic energy of a molecule. This is called Huckel rule.

To determine: An explanation corresponding to the fact that butadiene $\left({\text{C}}_{\text{4}}{\text{H}}_{\text{6}}\right)$ and 1, 3-cyclohexadiene $\left({\text{C}}_{\text{6}}{\text{H}}_{\text{8}}\right)$ is not considered as aromatic molecules.