A-LevelChemistryOrganic synthesisOct/Nov 2012Paper 1 Q241 Mark
But-2-ene-1,4-diol is converted in two steps through an intermediate X into ketobutanedioic acid. [Figure 24.1] What could be the reagent for step 1 and the intermediate X?
Areagent for step 1: cold acidified KMnO4, X: HOCH2CH2CH(OH)CH2OH
Breagent for step 1: hot acidified KMnO4, X: OHCCH(OH)CH2CHO
Creagent for step 1: steam and concentrated H2SO4, X: HOCH2CH(OH)CH2CH2OH
Dreagent for step 1: warm acidified K2Cr2O7, X: HO2CCH=CHCO2H
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The correct answer is C. This question tests the candidate's understanding of organic synthesis within the Chemistrysyllabus. The examiner's mark scheme requires...
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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...
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