A-LevelChemistryAnalytical techniques9701/12 · Feb/Mar 2022 · Q401 Mark

Which diagram shows the infrared spectrum of a compound that contains both a C=O and an O-H group? [Figure 40.1]

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ADiagram showing an infrared spectrum with a C=O absorption around 1700 cm⁻¹ but no broad O-H absorption.

BDiagram showing an infrared spectrum with a C=O absorption around 1700 cm⁻¹ and a broad O-H (carboxyl) absorption in the 2500-3000 cm⁻¹ range.

CDiagram showing an infrared spectrum with a broad O-H (hydroxy) absorption but no clear C=O absorption.

DDiagram showing an infrared spectrum with a broad O-H (hydroxy) absorption but no clear C=O absorption.

✓ Correct answer

B: Diagram showing an infrared spectrum with a C=O absorption around 1700 cm⁻¹ and a broad O-H (carboxyl) absorption in the 2500-3000 cm⁻¹ range.

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Topic: Analytical techniques, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Feb/Mar 2022 Paper 1 Variant 2, question 40.

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