An aldehyde and a ketone can be represented by the same molecular formula, say `C_3H_6O`. Write their structures and name them. State the relation between the two in the language of science.

Explanation

The aldehyde and ketone with the same molecular formula `C_3H_6O` are propanaldehyde and propanone. 
`underset("Propanal")(H-underset(H)underset(|)overset(H)overset(|)(C ) -underset(H)underset(|)overset(H)overset(|)(C )-overset(H)overset(|)(C )-O) " " underset("Propane")(H-underset(H)underset(|)overset(H)overset(|)(C )-underset(O)underset(|)(C )-underset(H)underset(|)overset(H)overset(|)(C )-H)`
They are called isomers.