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

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

Options:

  1. 2-Methylbutane
  2. 3-Methylbutane
  3. Butane
  4. Pentane

Correct Answer: 2-Methylbutane

Solution: 

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

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

Practice Questions

Q1
What is the IUPAC name for the compound CH3-CH(CH3)-CH2-CH3?
  1. 2-Methylbutane
  2. 3-Methylbutane
  3. Butane
  4. Pentane

Questions & Step-by-Step Solutions

What is the IUPAC name for the compound CH3-CH(CH3)-CH2-CH3?
Correct Answer: 2-Methylbutane
  • Step 1: Identify the longest continuous chain of carbon atoms in the compound CH3-CH(CH3)-CH2-CH3.
  • Step 2: Count the number of carbon atoms in the longest chain. In this case, there are four carbon atoms.
  • Step 3: Name the longest chain. A four-carbon chain is called 'butane'.
  • Step 4: Look for any branches (substituents) on the longest chain. There is a methyl group (CH3) attached to the second carbon.
  • Step 5: Indicate the position of the methyl group. Since it is on the second carbon, we write '2-Methyl'.
  • Step 6: Combine the names from Step 3 and Step 5 to get the full IUPAC name: '2-Methylbutane'.
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