A-LevelChemistryAnalytical techniques9701/12 · Oct/Nov 2022 · Q401 Mark

A molecule of an organic compound, P, contains three carbon atoms and shows a strong absorption at 1720 cm⁻¹ in its infrared spectrum. P is reacted with an excess of hot acidified potassium dichromate(VI) forming organic product Q. Q shows a strong absorption at 1700 cm⁻¹ and a strong, broad absorption centred at 2800 cm⁻¹ in its infrared spectrum. [Table 40.1: Bond, functional group, characteristic infrared absorption range]

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Apropanal

Bpropanone

Cpropan-1-ol

Dpropan-2-ol

✓ Correct answer

A: propanal

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

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