Chapter 15, Problem 22P

Interpretation Introduction

Interpretation: All the aromatic hydrocarbons that have molecular formula ${\text{C}}_{\text{8}}{\text{H}}_{\text{10}}$ are to be drawn. The number of isomers of molecular formula ${\text{C}}_{\text{8}}{\text{H}}_{\text{10}}\text{Br}$ is to be predicted.

Concept introduction: A molecule must be cyclic, planar, completely conjugated and should follow Huckel’s rule to be classified as aromatic. According to the Huckel’s rule the number of $\pi$ electrons in the molecule must be equal to $\left(4n+2\right)$.