Draw the structure for the following compounds:

(a) Ethanoic acid (b) Propanoic acid

11 Write the IUPAC names, common names and formulae of the first two members of the homologous series of carboxylic acids. 12 What is the common name of:

(a) methanoic acid, and (b) ethanoic acid?

14 Give the common names and IUPAC names of the following compounds:

(a) HCOOH

(b) CH₃COOH

15 Give the name and structural formula of one homologue of HCOOH.