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Which of the following is an example of cis-trans isomerism?

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Question: Which of the following is an example of cis-trans isomerism?

Options:

  1. 1-pentene
  2. 2-pentene
  3. 3-pentene
  4. Cyclopentane

Correct Answer: 2-pentene

Solution: 

2-pentene can exist in cis and trans forms due to the presence of a double bond.

Which of the following is an example of cis-trans isomerism?

Practice Questions

Q1
Which of the following is an example of cis-trans isomerism?
  1. 1-pentene
  2. 2-pentene
  3. 3-pentene
  4. Cyclopentane

Questions & Step-by-Step Solutions

Which of the following is an example of cis-trans isomerism?
Correct Answer: 2-pentene
  • Step 1: Understand what cis-trans isomerism means. It refers to the different arrangements of atoms around a double bond in a molecule.
  • Step 2: Identify that a double bond allows for different spatial arrangements of the attached groups.
  • Step 3: Recognize that in 2-pentene, there is a double bond between the second and third carbon atoms.
  • Step 4: Note that the two groups attached to the double bond can be on the same side (cis) or on opposite sides (trans).
  • Step 5: Conclude that since 2-pentene has a double bond, it can exist in both cis and trans forms, making it an example of cis-trans isomerism.
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