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Why are numbers not used to designate the position of the functional group in propanone and butanedione?
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Why are numbers not used to designate the position of the functional group in propanone and butanedione?

User Hsgubert
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The reason for this is that these two ketones are so small that they have only one possible ketone. So the number is usually omitted. Normally the ketone group needs a number but these two are exceptions
User Garvin
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