Name the first four members of the homologous series of carboxylic acids.

The first four members of the homologous series of carboxylic acids are methanoic acid, ethanoic acid, propanoic acid, and butanoic acid.

This question assesses the student's ability to recall specific examples of carboxylic acids, which is important for understanding their structure and properties in organic chemistry. This response is aligned to Carboxylic acids because it explains describe carboxylic acids as compounds that contain the functional group –COOH using the correct AQA GCSE Chemistry organic context. Keep molecular formula, structural formula, displayed formula, and general formula distinct. Do not confuse alkanes with alkenes, saturated with unsaturated, cracking with combustion, polymers with monomers, or hydrocarbons with oxygen-containing alcohols and carboxylic acids. When formulae are used, preserve the stored notation exactly and explain the GCSE chemistry idea in words rather than using unsupported displayed-formula diagrams.