Which of the following esters is more reactive towards hydrolysis?

For the following compounds, identify the products that would be obtained upon complete hydrolysis:

Draw a mechanism for the acid-catalyzed reaction of propionic acid and ethanol to form ethyl propionate, including all curved arrows. As a guide, consider the mechanism for the acid-catalyzed hydrolysis of an ester, where HB⁺ and :B represent the species that donate and remove protons, respectively.

Determine the acid-catalyzed hydrolysis products of the ester given below.

Propose the reagents required for the following conversion.
butan-1-ol → 2-hydroxypentanoic acid

Consider the following compound that has been labeled with the O-18 isotope of oxygen.

Write a plausible mechanism for the hydrolysis of this compound under acidic conditions.