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CAIE A Level Chemistry 9701 · Analytical techniques

Analytical techniques: suggest question

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An unknown organic compound, suspected to be an ester, is analysed by infrared spectroscopy. The spectrum shows a strong absorption at 1740 cm−1^{-1}, a strong broad absorption between 2500 and 3300 cm−1^{-1}, and a strong absorption at 1715 cm−1^{-1}. Suggest what the compound is likely to be, and explain how the infrared spectrum supports your suggestion. Use the following data: O–H (carboxylic acid) absorbs at 2500–3300 cm−1^{-1} (broad); C=O in an ester absorbs at 1735–1750 cm−1^{-1}; C=O in a carboxylic acid absorbs at 1710–1720 cm−1^{-1}.

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