Chapter 12, Problem 46P

Interpretation Introduction

Interpretation:

The molecular structure of the product is to be drawn and with the help of resonating structure, the reason for the statement that addition is preferred to the central ring is to be explained.

Concept introduction:

In $\text{1,4-addition}$ halogenation reaction of polycyclic aromatic hydrocarbons, the halogen atoms are attached to $\text{C-1}$ and $\text{C-4}$ carbon atoms respectively.

In polycyclic aromatic hydrocarbons, the most stable resonance contributor is the one with the greatest number of rings that correspond to Kekule formulation of benzene.