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What is the IUPAC name of CH3-CH=CH-CH2-CH3?

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Question: What is the IUPAC name of CH3-CH=CH-CH2-CH3?

Options:

  1. 1-Pentene
  2. 2-Pentene
  3. 3-Pentene
  4. Butene

Correct Answer: 2-Pentene

Solution: 

The longest carbon chain containing the double bond has five carbons, and the double bond starts at the second carbon, making it 2-Pentene.

What is the IUPAC name of CH3-CH=CH-CH2-CH3?

Practice Questions

Q1
What is the IUPAC name of CH3-CH=CH-CH2-CH3?
  1. 1-Pentene
  2. 2-Pentene
  3. 3-Pentene
  4. Butene

Questions & Step-by-Step Solutions

What is the IUPAC name of CH3-CH=CH-CH2-CH3?
  • Step 1: Identify the carbon chain in the molecule. Count the number of carbon atoms in the longest chain.
  • Step 2: In the given molecule CH3-CH=CH-CH2-CH3, there are 5 carbon atoms in a row.
  • Step 3: Determine if there are any double bonds in the chain. Here, there is a double bond between the second and third carbon atoms.
  • Step 4: Number the carbon atoms in the chain starting from the end closest to the double bond. This means the double bond starts at carbon 2.
  • Step 5: Use the IUPAC naming rules. Since there are 5 carbons in the chain, it is a 'pentene' because it has a double bond.
  • Step 6: Combine the position of the double bond with the name of the chain. The double bond starts at carbon 2, so the name is '2-Pentene'.
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