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
Hydrogen bonding affects physical properties. Use , and to answer.
Total: 5 marks
(a) Which of the three can form intermolecular hydrogen bonds? (2 marks)
(b) Explain why does not show such hydrogen bonding. (1 mark)
(c) Explain qualitatively why hydrogen bonding raises boiling point. (2 marks)
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