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Edexcel A-Level Chemistry AS 5.2 Geometric Isomerism in Terms of Restricted Rotation Around a C C Double Bond and the Nature of the Substituents on Questions

Inspect both alkene carbons for two different attached groups, keep connectivity unchanged and draw the alternative arrangement across the fixed double bond.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • Explain geometric isomerism through restricted rotation around a carbon–carbon double bond.
  • Check that each alkene carbon has two different substituents before assigning isomers.
  • Draw or select the alternative geometric isomer without changing atom connectivity.

Edexcel A-Level Chemistry AS 5.2 Geometric Isomerism in Terms of Restricted Rotation Around a C C Double Bond and the Nature of the Substituents on Questions question 1

[Maximum number: 2]

This question is about alkenes.

A straight-chain alkene, X, has the structure shown.

Figure for Question Edexcel A-Level Chemistry AS 5.2 Geometric Isomerism in Terms of Restricted Rotation Around a C C Double Bond and the Nature of the Substituents on Questions question 1 — Edexcel A-Level Chemistry AS

Explain why X can exist as geometric isomers.

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