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CAIE A-Level Chemistry AS 17.1.2 Describe Questions

Practise CAIE 9701 carbonyl reactions by reducing aldehydes and ketones, adding HCN with cyanide catalyst and writing balanced equations.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • reduce aldehydes to primary alcohols and ketones to secondary alcohols with NaBH4 or LiAlH4
  • add HCN with KCN catalyst and heat across C=O to form a hydroxynitrile with one extra carbon
  • write [H] accurately in reduction equations and preserve the carbon skeleton while identifying chiral products

CAIE A-Level Chemistry AS 17.1.2 Describe Questions question 1

[Maximum number: 1]

Which statement about butanone is correct?

A

Butanone can be dehydrated by concentrated sulfuric acid to give CH2=CHCH=CH2\mathrm{CH}_{2}=\mathrm{CHCH}=\mathrm{CH}_{2}.

B

Butanone gives a positive result with Tollens' reagent.

C

Butanone reacts with HCN by an electrophilic addition mechanism.

D

Butanone reacts with NaBH4\mathrm{NaBH}_{4} to give a chiral product.

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