NMR spectrum of pure acidified ethanol:

Under high resolution the absorption peaks due to methyl and methylene protons appear as triplet and quartet respectively where total areas are still in the ratio of 3:2. The appearance of triplet and quartet may be understood in terms of (n+1) rule where methyl protons interact with two protons of methylene group giving rise to 2+1 = 3 lines (triplet) in relative area ratio of 1:2:1. The methylene group protons interact with three protons of methyl group giving rise to 3 + 1 = 4 lines (quartet) in relative area ratio of 1:3:3:1 suggesting absence of any spin-spin interaction with the neighbouring hydroxyl group that appears as a singlet.

Figure: NMR spectrum of pure acidified ethanol at high resolution