PDF 1H & 13C NMR Spectroscopy answers - drclays-alevelchemistry.com 1H and 13C NMR Spectroscopy Answwers Mention of acid eg H 2 SO 4 OR alkali eg NaOH loses both M2 and M3. 1 M4 Nucleophilic substitution Can only score M3 if reagent correct. Ignore alcohol or ethanol (conditions) or Temp. 1 (c) Bromine (penalise Br but mark on) Acidified KMnO 4 (Penalise missing acid but mark on) Wrong reagent = no marks.