A-LevelChemistryAnalytical techniques9701/12 · May/June 2022 · Q361 Mark

Which compound forms a precipitate when mixed with 2,4-DNPH reagent and also forms a precipitate when mixed with Fehling's reagent?

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ASkeletal formula of 2-ethylcyclohexanone.

BSkeletal formula of 3,5-dimethylhexanal.

CSkeletal formula of 4-methylcyclohex-3-enone.

DSkeletal formula of 2-(2-formylethyl)cyclopentan-1-one.

✓ Correct answer

B: Skeletal formula of 3,5-dimethylhexanal.

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Topic: Analytical techniques, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2022 Paper 1 Variant 2, question 36.

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