plumiTests for aldehydes and ketones: OCR A‑Level Chemistry A questions
OCR A-Level Chemistry A past-paper questions on 6.1.2.3 Tests for aldehydes and ketones, 2016–2025, with mark schemes and examiner’s reports where available.
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Q21(b)
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All 9 questions on Tests for aldehydes and ketones, as a list
- June 2025, Paper 2, Q21(b) (2 marks): A chemical test is carried out which gives a positive result for all three compounds. Suggest the reagent and observation of this chemical test. Reagent Observa
- June 2023, Paper 2, Q2 (1 mark): Which compound reacts with 2,4-dinitrophenylhydrazine but does not react with Tollens’ reagent? A C6H5COCOOH B C6H5CH(OH)CHO C CH3COCHO D CH3CH2CH(OH)CH3 Your a
- June 2022, Paper 2, Q18(a)(i) (3 marks): Describe a chemical test to confirm the presence of a carbonyl group. How could the product of this test be used to identify the carbonyl compound? Your answer
- June 2022, Paper 2, Q18(a)(ii) (1 mark): Describe a chemical test that would identify whether a carbonyl compound is an aldehyde. Your answer should include the reagent and observations. [1]
- November 2020, Paper 2, Q19(b) (4 marks): Describe suitable chemical tests, with observations, that would confirm the presence of the functional groups in F and G. [4]
- June 2019, Paper 2, Q16(b)(i) (2 marks): Describe how the observations from a chemical test would distinguish between geraniol and citronellal. [2]
- June 2018, Paper 2, Q20(b)(ii) (1 mark): Describe a chemical test to confirm that both compounds contain an aldehyde functional group. Your answer should include the reagent and observations. [1]
- June 2018, Paper 2, Q20(b)(iii) (3 marks): Describe a chemical test to confirm that cinnamaldehyde and methylcinnamaldehyde contain a carbonyl group. How could the products of this test be used to distin
- June 2017, Paper 3, Q5(b) (6 marks): This question is about organic molecules that have a strong smell. (b)* The structures for six naturally occurring organic compounds with pleasant smells, B–G,
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