Write the functional group present in the following compound $C{H}_3\mathit{COC}{H}_{2}C{H}_{2}C{H}_{2}C{H}_3$ ?

The functional group present in the following compound $C{H}_3\mathit{COC}{H}_{2}C{H}_{2}C{H}_{2}C{H}_3$ is a ketone.
The presence of the carboxy group i.e. -CO group in the compound makes it a derivative of the ketone. The name of the compound given is hexanone which contains six carbon atoms and a ketone group and the suffix used for the ketone group is -one.