Which compound has E-Z isomers?
A CH₂=CHBr
B CH₂=CBR₂
C CHBr=CHBr
D CBr₂=CHBr - AQA - A-Level Chemistry - Question 23 - 2021 - Paper 3
Question 23
Which compound has E-Z isomers?
A CH₂=CHBr
B CH₂=CBR₂
C CHBr=CHBr
D CBr₂=CHBr
Worked Solution & Example Answer:Which compound has E-Z isomers?
A CH₂=CHBr
B CH₂=CBR₂
C CHBr=CHBr
D CBr₂=CHBr - AQA - A-Level Chemistry - Question 23 - 2021 - Paper 3
Step 1
Identify E-Z Isomerism
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Answer
E-Z isomerism occurs in alkenes where there are different substituents on each carbon of the double bond. For this to happen, each carbon in the double bond must have at least one substituent that is not hydrogen.
Step 2
Analyze Each Option
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Answer
A) CH₂=CHBr: This compound has E-Z isomers because the double bond (C=C) has two different substituents on each carbon.
B) CH₂=CBR₂: This does not exhibit E-Z isomerism as one carbon has two identical Br substituents, eliminating the possibility of different configurations.
C) CHBr=CHBr: This compound does not have different substituents on the double bond, thus no E-Z isomers are possible.
D) CBr₂=CHBr: Here, the double bond is also not suitable for E-Z designation due to identical Br atoms on one carbon.
Step 3
Determine the Correct Answer
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Answer
The only option that shows a possibility for E-Z isomerism is A) CH₂=CHBr. Hence, the correct answer is:
