Why is is this molecule called ketene? [duplicate]








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[Carbon with two double bonds and oxygen name](/questions/29526/carbon-with-two-double-bonds-and-oxygen-name)

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![enter image description here](https://i.stack.imgur.com/ZOROo.png)


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:


![enter image description here](https://i.stack.imgur.com/LYjtI.png)


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




This molecule is a ketene because it contains the ketene functional group:
![enter image description here](https://i.stack.imgur.com/bILkS.jpg)


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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