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

Question

Cohen Zavala

Chemistry

9 August, 06:49

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

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Nona · Answer 1

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