Aldehydes and ketones Quiz
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5 questions, one answer each
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1. Which reagent distinguishes propanal from propanone?
- A. 2,4-dinitrophenylhydrazine
- B. Tollens' reagent
- C. Iodine and alkali
- D. Bromine water
2. What is the organic product of reducing butanone with LiAlH₄ in dry ether?
- A. Butanal
- B. Butan-1-ol
- C. Butan-2-ol
- D. Butanoic acid
3. Why does propanone dissolve in water?
- A. It forms hydrogen bonds with itself
- B. Its oxygen lone pair accepts hydrogen bonds from water
- C. It ionises in water
- D. It has an O–H group
4. In the mechanism of HCN with a carbonyl compound, what is the first step?
- A. H⁺ attacks the oxygen
- B. CN⁻ attacks the δ+ carbon
- C. The C–H bond breaks
- D. Water attacks the carbon
5. Which compound gives a pale yellow precipitate with iodine and aqueous NaOH?
- A. Propanal
- B. Pentan-3-one
- C. Butanone
- D. Methanal