February/March 2026 Paper 12

2026 · 40 questions · 40 parts · 40 marks

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40Mass Spectrometry Infrared SpectroscopyHard1 mark
An organic compound, X, has the composition shown. C, 54.54%; H, 9.09%; O, 36.37%
Characteristic infrared absorption ranges
bondfunctional groups containing the bondcharacteristic infrared absorption range (in wavenumbers) / cm
C–Ohydroxy, ester1040–1300
aromatic compound, alkene1500–1680
amide carbonyl, carboxyl ester1640–1690 1670–1740 1710–1750
CNnitrile2200–2250
C–Halkane2850–2950
N–Hamine, amide3300–3500
O–Hcarboxyl hydroxy2500–3000 3200–3650
The infrared spectrum of X is shown.
an infrared spectrum of compound X: transmittance (0-100%) against wavenumber (4000-500 cm-1), with a sharp trough near 2950-3000 cm-1, a deep trough near 1700-1750 cm-1, and several troughs between roughly 1000 and 1300 cm-1, and no broad trough spanning 2500-3300 cm-1
What is compound X?