Solution:
i. Esterification is a chemical reaction between an organic/carboxylic acid and alcohol/alkanol to form ester and water only.
OR
Organic acid + Alcohol → ester + water.
ii. Saponification is a chemical reaction ( hydrolysis) of fat or oil with caustic alkali yielding soap and an Alkanol ( propane -1,2,3, triol) glycerol
OR
Fats/oil + caustic Alkali → soap + propane- 1, 2, 3, triol (Glycerol)