Long answer·Hard exam skill (4/5)·No calculator
Difficulty guide
The label describes the problem, not your ability.
1/5 - Foundational
Warm-up setup; checks one basic idea.
2/5 - Routine exam skill
Normal syllabus skill; usually one main rule or interpretation.
3/5 - Standard multi-step
Exam-style problem with multiple steps or a common trap.
4/5 - Hard exam skill
High-end exam problem; combines methods carefully.
5/5 - Challenge
Stretch problem beyond normal exam pressure.
Question
Three isomeric alcohols A, B and C have molecular formula . A gives immediate turbidity with Lucas reagent and resists ordinary oxidation. B gives a yellow iodoform precipitate and is oxidised to a ketone. C gives no immediate Lucas turbidity, gives no iodoform precipitate, and is oxidised to butanoic acid. Identify A, B and C.
Total: 3 marks
(a) Identify A and give the Lucas-test reason. (1 mark)
(b) Identify B and give the iodoform/oxidation reason. (1 mark)
(c) Identify C and give the oxidation reason. (1 mark)
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