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
Three unknown organic compounds are represented only by their formulas: P is , Q is and R is .
Total: 4 marks
(a) Which formula matches a saturated open-chain hydrocarbon? (1 mark)
(b) Which formula could contain one double bond in an open chain? (1 mark)
(c) Which formula could contain one triple bond in an open chain? (1 mark)
(d) State why a structural formula is still needed for certainty. (1 mark)
Something wrong with this item?