Why is is this molecule called ketene? 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:



So can we technically say that there is ketone in it?
This molecule is a ketene because it contains the ketene functional group:

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'.