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Which molecule can exist both a cis and a trans isomer? A - VCE - SSCE Chemistry - Question 13 - 2023 - Paper 1
Question 13
Which molecule can exist both a cis and a trans isomer? A. CH₃CBrCl B. CH₃CHBrCl C. CH₃CHClCH₁ D. (CH₃)₂CCCl₂
Worked Solution & Example Answer:Which molecule can exist both a cis and a trans isomer? A - VCE - SSCE Chemistry - Question 13 - 2023 - Paper 1
Step 1
Identify the structural characteristics of each option
Answer
In order for a molecule to exist as both a cis and trans isomer, it must have restricted rotation around a double bond or a ring structure and must possess two different groups attached to each carbon involved in the double bond or ring.
- A. CH₃CBrCl: This molecule has one carbon atom attached to both Br and Cl, allowing for isomerism.
- B. CH₃CHBrCl: This also has potential for cis and trans due to different substituents.
- C. CH₃CHClCH₁: This molecule has two identical hydrogen atoms, making it impossible to have cis and trans isomers.
- D. (CH₃)₂CCCl₂: The substituents allow for cis-trans isomerism, but due to symmetry, it may not yield different isomers.
Based on analysis, the ones that have potential for isomerism are A, B, and D.
Step 2