(a)[1]
On the displayed structure, circle the carboxylic acid functional group.
(b)[1]
State the molecular formula of glycolic acid, showing the numbers of carbon, hydrogen and oxygen atoms.
(c)[3]
Suggest a way to obtain a solution containing glycolic acid from sugar-cane plants.
(d)[1]
What does the term oxidation mean?
(e(i))[1]
Describe how the density of the carboxylic acids changes with the number of carbon atoms in one molecule.
(e(ii))[1]
Estimate the boiling point of propanoic acid.
(e(iii))[2]
What is the state of butanoic acid at $-10^\circ\text{C}$? Explain your answer.