May/June 2026 Paper 13

2026 · 40 questions · 40 parts · 40 marks

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39Mass Spectrometry Infrared SpectroscopyMedium1 mark
The infrared spectrum of compound X is shown.
Infrared spectrum of compound X: transmittance / % (vertical axis, 0 to 100) against wavenumber / cm$^{-1}$ (horizontal axis, 4000 down to 500). The trace stays close to 90% with minor dips from 4000-3000 cm$^{-1}$, then shows a cluster of strong, jagged troughs just below 3000 cm$^{-1}$ (dropping to about 30% transmittance), a broad flat plateau near 90% from about 2800-1750 cm$^{-1}$, a very deep, sharp trough close to 0% transmittance at about 1700 cm$^{-1}$, and a series of smaller, jagged dips of varying depth between about 1500 cm$^{-1}$ and 500 cm$^{-1}$.
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
What is compound X?