Answer : The correct option is, (D)
Explanation :
A ketone is an organic compound which contain a functional group with (-CO) i.e R-CO-R'
R-CO-R' functional group consists of a carbonyl center that means a carbon which is double-bonded to the oxygen. The carbon of this carbonyl group bonded with a carbon chain, (R) to one end and a carbon chain, (R') to another end.
For example : [tex]H_3C-CO-CH_3[/tex]
In the given options we conclude that, option D is a ketone.
Hence, the correct option is, (D)
