A-LevelChemistryCarboxylic acids and derivativesOct/Nov 2021Paper 1 Q291 Mark
Organic compound Z has an alcohol group and a carboxylic acid group. Compound Z reacts with magnesium carbonate to make a salt with a relative formula mass of 230.3. Compound Z does not react with acidified potassium manganate(VII). What could be the identity of compound Z?
A2-hydroxy-2-methylbutanoic acid
B2-hydroxy-2-methylpropanoic acid
C3-hydroxy-2-methylbutanoic acid
D3-hydroxy-2-methylpropanoic acid
✓ Correct Answer
The correct answer is B. 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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