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posted by  sani on 11/3/2009 1:18:30 PM  |  status: Closed  |  Earned Karma: 60

KETONES

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Organic Chemistry N/A N/A N/A 11/3/2009 at 5:00:00 PM
Question Details:
Can a molecule with molecular formula C40H82O be a ketone?Why?
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posted by TAKSHILA (MNK) on 11/3/2009 1:36:39 PM  |  status: Live
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ketone formula is given by: CnH2nO and it does not follow it
here n = 40 but 2n = 82 it should be 80
so it is not a ketone
if u have any doubt further do contact me becoz cramster is all about being clear and thats y m here :)
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posted by sekushii on 11/3/2009 3:00:55 PM  |  status: Live
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The index of hydrogen deficiency allows you to calculate the number of possible π-bonds and/or rings from a molecular formula.

The IHD for this formula is = 1/2[(2(40)+2) - (82)] = 0

There are no π-bonds in this molecule, and since a ketone must have 1 π-bond, this molecule cannot have this functional group.
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