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

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?

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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
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User Garvin
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