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The marking scheme says that the molecule has both alkene and ketone. So there is carbon to carbon double bond.ok.check there is alkene.But what about ketone.Ketone has this structure:

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So can we technically say that there is ketone in it?

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This molecule is a ketene because it contains the ketene functional group: enter image description here

Whilst the ketene appears to contain an alkene and a ketone functional group, which as you have suggested is where its name comes from, its chemistry is notably different from both of its 'constituent groups'.

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