1) Below is a generalised depiction of a reaction between a carboxylic acid (in this case butanoic acid) and an alcohol (ethanol). What type of reaction is this: addition, elimination, substitution or condensation?
2) Cosmetic companies will often deliberately synthesise esters with a particular scent to add to their perfume. Take a look at the reactants required to yield the ester ethyl butanoate in the above reaction. What reactants (carboxylic acid and alcohol) might you combine if you wish to yield an ester that has a banana smell?