A-LevelChemistryOrganic synthesisFeb/Mar 2023Paper 1 Q331 Mark
Citric acid can be converted into tricarballylic acid in two stages. An intermediate, Q, is formed. [Figure 33.1: Reaction scheme showing citric acid (HOOCCH₂C(OH)(COOH)CH₂COOH) converting via stage 1 to intermediate Q (HOOCCH₂CH(COOH)CH₂COOH), and then Q converting via stage 2 to tricarballylic acid (CH₂COOHCH(COOH)CH₂COOH).] Which reagents are needed for each stage? [Table with columns "stage 1", "stage 2"]
Aconcentrated H2SO4, H2(g) and Ni
Bconcentrated H2SO4, LiAlH4
CLiAlH4, H2SO4(aq)
DNaOH(aq), H2(g) and Ni
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The correct answer is A. This question tests the candidate's understanding of organic synthesis within the Chemistrysyllabus. The examiner's mark scheme requires...
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