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
Molecules P, Q and R have central-atom electron domains as follow; Q has three bond pairs and no lone pair; R has two bond pairs and two lone pairs.
Total: 5 marks
(a) Predict shape of P. (1 mark)
(b) Predict shape of Q. (1 mark)
(c) Predict shape of R. (1 mark)
(d) Which one is expected to have the smallest listed bond angle? Why? (2 marks)
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