An aldehyde as well as a ketone can be represented by the same molecular formula, say C3H6O. Write their structures and name them. State the relation between the two in the language of science.

The aldehyde and ketone that can be represented by molecular formula C3H6O are propanal and propanone respectively.

Aldehyde - Propanal - CH3CH2CHO
Ketone - Propanone - CH3COCH3

These two carbon compounds are called functional isomers. They do not have the same physical properties since their functional group is different. When hydrogen is present on one side of C=O group and the other side is R, (RCHO), then it is an aldehyde group. When R is present on both sides of C=O group, then it is a ketone.