The hydrocarbons with
functional group are called ketone
group is known as Ketone group(common system)
General formula of Ketones is 
R and R1 are alkyl groups which may be same or different.
Carboxylic acidsThe general molecular formula of carboxylic acid is R – COOH,where R is an alkyl group or H atom

Ethers are carbon compounds related to H2 O in such a way that both hydrogen atoms are replaced by two alkyl groups which may be same or different

These compounds are derivatives of carboxylic acids. If the hydrogen atom of - COOH gets replaced by ‘R’, the alkyl group esters are obtained.

If hydrogen atom is replaced from NH3 by an alkyl group are called Amines. - NH2 group is called amine group