Write the name and chemical formula of the simplest organic acid.

8 What is the common name of propanone? 9 Write the IUPAC names of the following:

(i) CH₃COCH₃

(ii) CH₃COCH₂CH₃

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?