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 student compares three low-molar-mass compound, propanone and propanoic acid. Use structure and intermolecular forces to answer the following.
Total: 4 marks
(a) Which compound can both donate and accept hydrogen bonds with water? (1 mark)
(b) Which compound has the highest boiling point? (1 mark)
(c) Why are propanal and propanone less strongly associated than propanoic acid? (2 marks)
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