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What is the IUPAC name of CH3-CH2-CH(CH3)-CH2-CH3?

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

Options:

  1. 2-Pentyl
  2. 3-Pentyl
  3. 2-Methylpentane
  4. 3-Methylpentane

Correct Answer: 2-Methylpentane

Solution: 

The longest carbon chain has 5 carbons, and there is a methyl group on the second carbon, making it 2-Methylpentane.

What is the IUPAC name of CH3-CH2-CH(CH3)-CH2-CH3?

Practice Questions

Q1
What is the IUPAC name of CH3-CH2-CH(CH3)-CH2-CH3?
  1. 2-Pentyl
  2. 3-Pentyl
  3. 2-Methylpentane
  4. 3-Methylpentane

Questions & Step-by-Step Solutions

What is the IUPAC name of CH3-CH2-CH(CH3)-CH2-CH3?
  • Step 1: Identify the carbon chain in the molecule. Count the number of carbon atoms in the longest continuous chain.
  • Step 2: In the given structure CH3-CH2-CH(CH3)-CH2-CH3, the longest chain has 5 carbon atoms.
  • Step 3: Name the longest chain. A 5-carbon chain is called 'pentane'.
  • Step 4: Look for any branches (substituents) on the main chain. Here, there is a methyl group (CH3) attached to the second carbon.
  • Step 5: Number the carbon atoms in the main chain starting from the end closest to the substituent. The methyl group is on the second carbon.
  • Step 6: Combine the substituent name and the main chain name. The methyl group on the second carbon gives us '2-Methyl'.
  • Step 7: Combine the substituent and the main chain name to get the final IUPAC name: '2-Methylpentane'.
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