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Pearson Edexcel IAL Chemistry 5.3 E-Z naming

Practise E-Z naming by assigning priorities at C=C bonds, choosing correct IUPAC names and drawing named geometric isomers.

Syllabus
First assessment 2019
Course
Chemistry YCH11
Level
AS

Exam points

  • assign E or Z by comparing the highest-priority group on each carbon of the C=C bond
  • choose the correct IUPAC name for halogenated alkenes with locants and E-Z labels
  • explain when E-Z naming is needed because cis-trans naming cannot describe the structure

5.3—The E–Z naming system for geometric isomers and why it is necessary to use this when the cis- and trans- naming system question 1

[Maximum number: 1]

Geometric isomerism is shown by 2-chlorobut-2-ene.

What is the skeletal formula of E-2-chlorobut-2-ene?

A
Figure for Question 5.3—The E–Z naming system for geometric isomers and why it is necessary to use this when the cis- and trans- naming system question 1 — Edexcel A-Level Chemistry AS — Option A
B
Figure for Question 5.3—The E–Z naming system for geometric isomers and why it is necessary to use this when the cis- and trans- naming system question 1 — Edexcel A-Level Chemistry AS — Option B
C
Figure for Question 5.3—The E–Z naming system for geometric isomers and why it is necessary to use this when the cis- and trans- naming system question 1 — Edexcel A-Level Chemistry AS — Option C
D
Figure for Question 5.3—The E–Z naming system for geometric isomers and why it is necessary to use this when the cis- and trans- naming system question 1 — Edexcel A-Level Chemistry AS — Option D
A

Structure A

B

Structure B

C

Structure C

D

Structure D

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