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CAIE A-Level Chemistry AS 13.4.3 Geometrical Cis Trans Isomerism in Alkenes Questions

Practise deciding whether an alkene shows cis/trans isomerism, drawing both arrangements and explaining how the C=C π bond restricts rotation in CAIE 9701 questions.

Syllabus
2028–2030
Course
Chemistry 9701
Level
AS

Exam points

  • check that each carbon of the C=C bond carries two different substituents before drawing geometrical isomers
  • draw cis and trans arrangements with corresponding groups on the same or opposite sides of the C=C bond
  • explain that the π bond restricts rotation, so the two alkene arrangements do not interconvert freely

CAIE A-Level Chemistry AS 13.4.3 Geometrical Cis Trans Isomerism in Alkenes Questions question 1

[Maximum number: 1]

Which alkene shows geometric isomerism?

A

CH3CH2CH2CH=CH2\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CH}_{2}

B

CH3CH2CH=CHCH3\mathrm{CH}_{3} \mathrm{CH}_{2} \mathrm{CH}=\mathrm{CHCH}_{3} C

C
Figure for Question CAIE A-Level Chemistry AS 13.4.3 Geometrical Cis Trans Isomerism in Alkenes Questions question 1 — CAIE A-Level Chemistry AS — Option C
D
Figure for Question CAIE A-Level Chemistry AS 13.4.3 Geometrical Cis Trans Isomerism in Alkenes Questions question 1 — CAIE A-Level Chemistry AS — Option D
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