During the prolonged storage of craft cider in an unsealed wooden cask, ethanol (C2H5OH\text{C}_2\text{H}_5\text{OH}C2H5OH) is slowly oxidised by atmospheric oxygen to form compound W with the molecular formula C2H4O2\text{C}_2\text{H}_4\text{O}_2C2H4O2.
Compound W is responsible for the sour, vinegar-like taste of the spoiled cider and belongs to a different homologous series than ethanol.
State the name of the homologous series to which compound W belongs.
Practise Edexcel GCSE Chemistry Alcohols and carboxylic acids with exam-style questions for Foundation and Higher tier. 55 questions, matched to the Edexcel GCSE Chemistry (1CH0) specification and written in Paper 1 and Paper 2 style. Every question includes a full worked solution and mark scheme, so you can see where marks are awarded rather than just whether you got the answer right.
