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What is the correct IUPAC name for CH3-CH2-CH=CH2?

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

Options:

  1. Butene
  2. 1-Butene
  3. 2-Butene
  4. Propene

Correct Answer: 1-Butene

Solution: 

The compound CH3-CH2-CH=CH2 is named 1-butene, as the double bond is located between the first and second carbon atoms.

What is the correct IUPAC name for CH3-CH2-CH=CH2?

Practice Questions

Q1
What is the correct IUPAC name for CH3-CH2-CH=CH2?
  1. Butene
  2. 1-Butene
  3. 2-Butene
  4. Propene

Questions & Step-by-Step Solutions

What is the correct IUPAC name for CH3-CH2-CH=CH2?
  • Step 1: Identify the longest continuous chain of carbon atoms in the compound. In CH3-CH2-CH=CH2, the longest chain has 4 carbon atoms.
  • Step 2: Count the number of carbon atoms in the longest chain. There are 4 carbon atoms, which means the base name will be 'butane'.
  • Step 3: Determine the type of bonds in the chain. There is a double bond (indicated by '=') between the third and fourth carbon atoms.
  • Step 4: Since there is a double bond, change the suffix from '-ane' to '-ene'. This gives us 'butene'.
  • Step 5: Number the carbon atoms in the chain starting from the end closest to the double bond. The double bond is between carbon 1 and carbon 2.
  • Step 6: Indicate the position of the double bond in the name. The double bond starts at carbon 1, so we name it '1-butene'.
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