Case study·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
The figure shows three carbon compounds P, Q and R. A student tests each with blue litmus, sodium hydrogen carbonate and bromine water.
Total: 5 marks
(a) Which compound is an alcohol? (1 mark)
(b) Which compound turns blue litmus red? (1 mark)
(c) Which compound decolourises bromine water? Give the reason. (2 marks)
(d) Write the IUPAC name of Q. (1 mark)
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