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 learner draws the bond-line formula shown and says every corner must be a hydrogen atom because no carbon symbols are written.
Total: 4 marks
(a) What does each line end or bend represent? (1 mark)
(b) How are hydrogens attached to carbon shown in this notation? (2 marks)
(c) Why is the written group not omitted? (1 mark)
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