Chapter 19.9, Problem 15CC

Interpretation Introduction

Interpretation:

The regiochemical outcome for the reaction of Chlorination of Bromobenzene has to be illustrated.

Concept Introduction:

• Chlorination of aromatic compounds is imparting $\text{-Cl}$ group in an aromatic ring by replacing one of its Hydrogen atoms. One of the methods used to achieve this is ${\text{Cl}}_{\text{2}}{\text{/AlCl}}_{\text{3}}$ where ${\text{AlCl}}_{\text{3}}$ is a Lewis acid. This reaction is constructive method to impart $\text{-Cl}$ group in an aromatic ring.

• The term Regioselectivity is referred as preference of a particular group to occupy a specific position in a compound. In case an aromatic ring has one or more than one substituents the position in the aromatic ring occupied by the incoming electrophile depends on various factors.

• Reactions always take place in such a way to furnish most stable products. In reactions of aromatic compounds the stability of a product is attributed to the number of resonance structures it forms.