A-LevelChemistryOrganic synthesisFeb/Mar 2016Paper 1 Q231 Mark
But-2-ene-1,4-diol is converted in two steps through an intermediate X into oxobutanedioic acid. HOCH₂CH=CHCH₂OH but-2-ene-1,4-diol step 1 X step 2 hot, acidified KMnO₄ HO₂CCOCH₂CO₂H oxobutanedioic acid What could be the reagent for step 1 and what is the intermediate X?
Acold, acidified KMnO₄, HOCH₂CH₂CH(OH)CH₂OH
Bhot, acidified K₂Cr₂O₇, HO₂CCH=CHCO₂H
Csteam and concentrated H₂SO₄, HOCH₂CH(OH)CH₂CH₂OH
Dwarm, acidified K₂Cr₂O₇, OHCCH(OH)CH₂CHO
✓ Correct Answer
The correct answer is C. This question tests the candidate's understanding of organic synthesis within the Chemistrysyllabus. The examiner's mark scheme requires...
📋 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...
🔒
Unlock the Examiner's Answer
Sign up for free to reveal the correct answer, the official mark scheme breakdown, and the examiner trap analysis for this question.
Sign Up Free to Unlock →Join thousands of Cambridge students already using Oracle Prep