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What is the molecular formula of butan-2-one?

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Question: What is the molecular formula of butan-2-one?

Options:

  1. C4H8O
  2. C4H10O
  3. C4H6O
  4. C4H12O

Correct Answer: C4H8O

Solution: 

The molecular formula of butan-2-one is C4H8O.

What is the molecular formula of butan-2-one?

Practice Questions

Q1
What is the molecular formula of butan-2-one?
  1. C4H8O
  2. C4H10O
  3. C4H6O
  4. C4H12O

Questions & Step-by-Step Solutions

What is the molecular formula of butan-2-one?
  • Step 1: Identify the name of the compound, which is butan-2-one.
  • Step 2: Break down the name 'butan-2-one'. 'Butan' indicates that the compound has 4 carbon atoms (C4).
  • Step 3: The '2' in 'butan-2-one' indicates the position of the ketone group (C=O) on the second carbon.
  • Step 4: Since it is a ketone, there is one oxygen atom (O) in the molecular formula.
  • Step 5: Count the hydrogen atoms. For butan-2-one, there are 8 hydrogen atoms (H8) to satisfy the carbon and oxygen bonding.
  • Step 6: Combine the counts of carbon, hydrogen, and oxygen to form the molecular formula: C4H8O.
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