Lesson 6.1.2

6.1.2 Carbonyl compounds Quiz: OCR Chemistry, Unit 5

20 questions

Written by Revision Ninja · Last reviewed 11 October 2026

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Lesson 6.1.2, Carbonyl compounds: 20 multiple choice questions for the OCR Chemistry (H432), Unit 5: Organic chemistry and analysis, written with Revision Ninja.

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The 20 questions

  1. What is the product when an aldehyde is oxidised by acidified potassium dichromate(VI)?

    • A primary alcohol
    • A carboxylic acid
    • An ester
    • A ketone

  2. What is the product of the reaction of a carbonyl compound with HCN, through NaCN(aq) and H+(aq)?

    • A carboxylic acid
    • An amine
    • An alkene
    • A hydroxynitrile

  3. Which species acts as the initial nucleophile in the addition of HCN to an aldehyde?

    • Hydride ion
    • Hydrogen ion
    • Nitrogen atom
    • Cyanide ion

  4. An orange precipitate with 2,4-dinitrophenylhydrazine indicates the presence of which functional group?

    • Carbonyl group
    • Carboxyl group
    • Ester group
    • Hydroxyl group

  5. How can a purified 2,4-DNP derivative be used to identify a specific aldehyde or ketone?

    • Measure melting point
    • Measure boiling point
    • Determine molar mass
    • Measure optical rotation

  6. What visual observation occurs when an aldehyde is warmed with Tollens' reagent?

    • Orange precipitate
    • Blue solution
    • Effervescence
    • Silver mirror

  7. What is observed when a ketone is heated with Tollens' reagent?

    • Red precipitate
    • No reaction
    • Silver mirror
    • Gas evolution

  8. What is the product when propanal reacts with NaBH4 and then water?

    • Propanoic acid
    • Propan-2-ol
    • Propan-1-ol
    • Propanone

  9. What is the product when propanone reacts with NaBH4 and then water?

    • Propan-1-ol
    • Propan-2-ol
    • Propanoic acid
    • Propanal

  10. What is the product when ethanal reacts with HCN and then the nitrile is considered?

    • Ethanoic acid, CH3COOH
    • 2-hydroxypropanenitrile, CH3CH(OH)CN
    • Propanenitrile, CH3CH2CN
    • Ethylamine, CH3CH2NH2

  11. Ethanal is oxidised with acidified dichromate. What colour change is seen?

    • Orange to green
    • Green to orange
    • Yellow to purple
    • Colourless to blue

  12. Which type of reaction occurs when HCN reacts with an aldehyde?

    • Nucleophilic substitution
    • Free radical substitution
    • Nucleophilic addition
    • Electrophilic addition

  13. What product mixture is formed when HCN adds to ethanal?

    • Geometric isomers
    • Racemic mixture
    • Structural isomers
    • Single enantiomer

  14. What is the product of propanone reacting with HCN, followed by acid hydrolysis of the nitrile?

    • 2-methylpropanoic acid
    • 2-hydroxy-2-methylpropanoic acid
    • Propan-2-ol
    • Propan-2-amine

  15. An unknown compound forms an orange precipitate with 2,4-DNP but no mirror with Tollens' reagent. What is it?

    • An aldehyde
    • An alcohol
    • A ketone
    • A carboxylic acid

  16. Which species acts as the nucleophile in the reduction of aldehydes using NaBH4?

    • Hydroxide ion
    • Hydronium ion
    • Sodium ion
    • Hydride ion

  17. What is the product of reducing butanone with NaBH4 followed by water?

    • Butan-2-one
    • Butan-2-ol
    • Butan-1-ol
    • Butanoic acid

  18. What is the product of reducing phenylethanone (acetophenone) with NaBH4 followed by water?

    • 1-phenylethanol
    • Phenylethanoic acid
    • Ethylbenzene
    • 2-phenylethanol

  19. Which organic ion is formed when benzaldehyde is oxidised by Tollens' reagent before acidification?

    • Phenoxide ion
    • Benzoate ion
    • Benzyl ion
    • Benzoyl ion

  20. Which intermediate ion is formed immediately after nucleophilic attack on a carbonyl compound by CN⁻?

    • Carbocation
    • Carbanion
    • Hydroxide ion
    • Alkoxide ion

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