Short answer·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
Compare the hybridisation of carbon atoms in ethane, ethene and ethyne.
Total: 5 marks
(a) State hybridisation in ethane. (1 mark)
(b) State hybridisation in ethene. (1 mark)
(c) State hybridisation in ethyne. (1 mark)
(d) Link each to number of electron domains. (2 marks)
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