A-LevelChemistryCarboxylic acids and derivativesFeb/Mar 2016Paper 1 Q271 Mark
The fragrance compounds of perfumes are often dissolved in solvent Y, which has a molecular formula C₇H₁₂O₄. It is made by reacting propane-1,2-diol with ethanoic acid in the presence of an acid catalyst. [Figure showing structure of propane-1,2-diol] What is the structure of solvent Y?
AStructural diagram A, an ether-acetal derivative.
BStructural diagram B, an ester with an ether group.
CStructural diagram C, 1,2-diacetoxypropane derived from HOCH₂CH(OH)CH₃.
DStructural diagram D, 1,2-diacetoxypropane derived from HOCH(CH₃)CH₂OH.
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The correct answer is D. This question tests the candidate's understanding of carboxylic acids and derivatives 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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