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
An unknown aldehyde-or-ketone compound with formula gives 2,4-DNP test, reduces Tollens' reagent, and undergoes Cannizzaro reaction but not aldol reaction. Identify and write the Cannizzaro products.
Total: 4 marks
(a) Identify the functional group from the first two tests. (1 mark)
(b) Use the aldol/Cannizzaro behaviour to identify . (1 mark)
(c) Write the products of Cannizzaro reaction. (2 marks)
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