Case study·Standard multi-step (3/5)·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
A laboratory has three starting materials: , and . A student must prepare carbonyl compounds under controlled conditions.
Total: 3 marks
(a) Which starting material can give ethanal by Rosenmund reduction? (1 mark)
(b) Which starting material gives ethanal by Stephen reduction followed by hydrolysis? (1 mark)
(c) Which starting material gives propanone on mercuric-ion catalysed hydration? (1 mark)
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