A-LevelChemistryOrganic synthesis9701/12 · Oct/Nov 2023 · Q331 Mark

Propanoic acid can be used to make propene by a two-stage synthesis. Which row shows suitable reagents for this synthesis?

Areagent for first stage: LiAlH4, reagent for second stage: conc. H2SO4

Breagent for first stage: LiAlH4, reagent for second stage: NaOH in ethanol

Creagent for first stage: NaBH4, reagent for second stage: conc. H2SO4

Dreagent for first stage: NaBH4, reagent for second stage: NaOH in ethanol

✓ Correct answer

A: reagent for first stage: LiAlH4, reagent for second stage: conc. H2SO4

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Topic: Organic synthesis, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, Oct/Nov 2023 Paper 1 Variant 2, question 33.

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