Chapter 22, Problem 22.63P

Interpretation Introduction

Interpretation: A stepwise mechanism for the conversion of lactone A to ester B by the use of $\text{HCl}$ in ethanol is to be drawn.

Concept introduction: The replacement or substitution of one functional group with another different functional group in any chemical reaction is termed as substitution reaction. The electron rich chemical species that contains negative charge or lone pair of electrons are known as nucleophile. In nucleophilc acyl substitution reaction, nucleophile takes the position of leaving group.