What is the functional group of an alcohol, aldehyde, and ketone?

Functional Group of Alcohol, aldehydes and ketones are as follows:

Alcohol: alkyl ##-## OH Aldehyde: alkyl ##-## CH ##=## O Ketone: alkyl ##-## C ##-## alkyl , with a double bonded oxygen atom on the carbon (couldn't show that with the help of the symbols)

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