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What is the IUPAC name for the compound with the formula C5H10O that contains a

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Question: What is the IUPAC name for the compound with the formula C5H10O that contains a ketone functional group?

Options:

  1. 2-Pentanone
  2. 3-Pentanone
  3. 1-Pentanone
  4. Pentanal

Correct Answer: 2-Pentanone

Solution: 

The compound is a ketone with five carbon atoms. The longest carbon chain is pentane, and the ketone group is on the second carbon, making the IUPAC name 2-Pentanone.

What is the IUPAC name for the compound with the formula C5H10O that contains a

Practice Questions

Q1
What is the IUPAC name for the compound with the formula C5H10O that contains a ketone functional group?
  1. 2-Pentanone
  2. 3-Pentanone
  3. 1-Pentanone
  4. Pentanal

Questions & Step-by-Step Solutions

What is the IUPAC name for the compound with the formula C5H10O that contains a ketone functional group?
  • Step 1: Identify the molecular formula, which is C5H10O. This indicates that the compound has 5 carbon atoms, 10 hydrogen atoms, and 1 oxygen atom.
  • Step 2: Determine the functional group. Since the compound contains a ketone functional group, we know it has a carbonyl group (C=O) located between two carbon atoms.
  • Step 3: Count the carbon atoms in the longest chain. With 5 carbon atoms, the longest chain is called pentane.
  • Step 4: Identify the position of the ketone group. In a ketone, the carbonyl group is located on a carbon that is not at the end of the chain. For 5 carbon atoms, the ketone can be on the 2nd or 3rd carbon.
  • Step 5: Choose the lowest number for the ketone position. The ketone group is on the 2nd carbon, so we name it 2-Pentanone.
  • Step 6: Combine the information to write the IUPAC name: 2-Pentanone.
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