Is chlorophyll a ketone?
Several biological molecules have a more than one functional group attached to them. Technically, when a C=O group is present, the molecule will undergo all (or nearly all) of the reactions that a normal ketone undergoes. I personally would not call chlorophyll a ketone, because by the same reasoning, it also can be considered to be an ester and an alkene due to the presence of RCOOR and C=C groups respectively. Its better to refer to chlorophyll a as an organic molecule or a composite molecule having several different functional groups.
