$^1$notes

$^2$https://byjus.com/chemistry/ester/#what-is-esterification?

$^3$https://www.chemistrysteps.com/naming-esters/

$^4$https://chem.libretexts.org/Bookshelves/Organic_Chemistry/Supplemental_Modules_(Organic_Chemistry)/Carboxylic_Acids/Reactivity_of_Carboxylic_Acids/Simple_Reactions_of_Carboxylic_Acids_as_Acids

$^5$https://www.chemguide.co.uk/organicprops/alkenes/halogenation.html