A-LevelChemistryAnalytical techniquesOct/Nov 2025Paper 1 Q401 Mark
The purity of a compound can be determined using infrared spectroscopy. The table gives the characteristic infrared absorption frequencies for some selected bonds. [Figure 40: Table of IR absorption frequencies] Propan-2-ol is made by hydration of propene. A sample of the product is obtained. Which feature of the infrared spectrum of the product would show that no propene remains in the product?
Aabsorption in the 2900 cm⁻¹ region
Bstrong absorption below 1000 cm⁻¹
Cthe lack of absorption at or near 1250 cm⁻¹
Dthe lack of absorption at or near 1550 cm⁻¹
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