Explain which of the three compounds has a \(^{\text{1}}{\text{H}}\,{\text{NMR}}\) spectrum showing two peaks with equal areas under each peak.

methyl ethanoate;

the only one with (the six H atoms in) two different chemical environments / the two CH₃ groups give equal areas / OWTTE;

Award [1] for correct second marking point in (a)–(c) even if compound is wrongly identified.

Many students could use the spectroscopic data provided to correctly identify the compounds, with the first part of the question, dealing with mass spectrometer data, probably proving the most challenging.