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CAIE A-Level Chemistry AS 13.4.4 Chiral Centres and Enantiomers Questions

Practise identifying chiral centres, explaining why they produce two non-superimposable enantiomers and drawing their three-dimensional arrangements in CAIE 9701 questions.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • identify a chiral centre as a tetrahedral atom, normally carbon, bonded to four different atoms or groups
  • explain that one chiral centre gives a pair of optical isomers (enantiomers) with non-superimposable mirror-image arrangements
  • draw or recognise the two three-dimensional enantiomers and explain why molecules lacking four different groups do not form this pair

CAIE A-Level Chemistry AS 13.4.4 Chiral Centres and Enantiomers Questions question 1

[Maximum number: 1]

Which compound will react with LiAlH4\mathrm{LiAlH}_{4} to form two optical isomers?

A

CH3CH2COCH3\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COCH}_{3}

B

CH3CH2CH2CHO\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CHO}

C

CH3CH2COCH2CH3\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{COCH}_{2} \mathrm{CH}_{3}

D

CH3CH(CH3)CH2CO2H\mathrm{CH}_{3} \mathrm{CH}\left(\mathrm{CH}_{3}\right) \mathrm{CH}_{2} \mathrm{CO}_{2} \mathrm{H}

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