Chapter 17, Problem 17.42P

Interpretation Introduction

Interpretation: An explanation corresponding to the given statement that $\text{α-pyrone}$ reacts with ${\text{Br}}_{\text{2}}$ to yield a substitution product, rather than an addition product to one of its $\text{C}=\text{C}$ bonds is to be stated.

Concept introduction: In addition reactions the aromaticity of compound is lost, whereas in substitution it is retained. Therefore, aromatic compounds prefer substitution reaction rather than addition reaction.