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CHEMISTRY, M7 2019 HSC 10 MC

Which class of organic compound must contain at least three carbon atoms?

  1. Aldehydes
  2. Alkenes
  3. Carboxylic acids
  4. Ketones
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`D`

Show Worked Solution

By elimination:

  • Aldehydes can form methanal (1 carbon atom – eliminate A)
  • Alkenes can form ethene (2 carbon atoms – eliminate B)
  • Carboxylic acids can form methanoic acid (1 carbon atom – eliminate C)
  • Ketones can for propanone (3 carbon atoms)

`=>D`