A-LevelChemistryCarbonyl compounds9701/12 · May/June 2017 · Q271 Mark

H₂NNHC₆H₃(NO₂)₂ is the structural formula of 2,4-DNPH. Many, but not all, organic reactions need to be heated before reaction occurs. Which reaction occurs at a good rate at room temperature (20 °C)?

AC₁₀H₂₂ → C₈H₁₈ + C₂H₄

BCH₃CH₂CH₂Br + NH₃ → CH₃CH₂CH₂NH₂ + HBr

CCH₃CH₂OH + KBr → CH₃CH₂Br + KOH

D(CH₃)₂CO + H₂NNHC₆H₃(NO₂)₂ → (CH₃)₂C=NNHC₆H₃(NO₂)₂ + H₂O

✓ Correct answer

D: (CH₃)₂CO + H₂NNHC₆H₃(NO₂)₂ → (CH₃)₂C=NNHC₆H₃(NO₂)₂ + H₂O

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Topic: Carbonyl compounds, A-Level Chemistry (syllabus 9701). Multiple choice, 1 mark.
Source: A-Level Chemistry, May/June 2017 Paper 1 Variant 2, question 27.

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