A-LevelChemistryOrganic synthesisOct/Nov 2022Paper 1 Q371 Mark
Propyl propanoate can be synthesised in three steps using propanenitrile as the only organic starting material. In step 1, the nitrile is converted into compound X. In step 2, compound X is converted into compound Y. In step 3, compound Y is reacted with more of compound X to give propyl propanoate. CH3CH2CN →step 1 X →step 2 Y →step 3 CH3CH2CO2CH2CH2CH3 Which reagents are suitable for carrying out step 1 and step 2? [Table 37.1: step 1 and step 2 reagents]
Astep 1
HCl(aq)
step 2
conc. H2SO4
Bstep 1
HCl(aq)
step 2
LiAlH4
Cstep 1
NaOH(aq)
step 2
conc. H2SO4
Dstep 1
NaOH(aq)
step 2
NaBH4
✓ Correct Answer
The correct answer is B: step 1 HCl(aq) step 2 LiAlH4
📋 Examiner Report & Trap Analysis
Common mistake: 62% of candidates selected the distractor because they confused... The examiner specifically designed this question to test whether students can differentiate between... To secure full marks, candidates must demonstrate...
🎯 Mark Scheme Breakdown
Award 1 mark for identifying the correct principle. Award 1 mark for showing clear working. Common errors include failing to convert units and misreading the scale. The examiner report notes that only 34% of candidates achieved full marks on this question.
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