22. Carboxylic Acid Derivatives: NAS

Which carboxylic acid is required to synthesize $\mathrm{isobutyl}\mathrm{benzoate}$ via Fischer esterification with $\mathrm{isobutanol}$?

Which of the following is the correct IUPAC name for a carboxylic acid with a straight chain of $4$ carbon atoms and a carboxyl group at one end?

Using IUPAC guidelines, what is the correct name for the carboxylic acid with the structure ${\mathrm{CH}}_3\mathrm{CH}-\mathrm{COOH}$?

What is the correct IUPAC name for the compound ${\mathrm{CH}}_3\mathrm{CH}-\mathrm{COOH}$?

Provide the IUPAC name for the following compound.

Provide the IUPAC name for the following compound.