Question

isomers for propanone

Answer 1

There are no isomers of propane as there are only 3 carbon atoms, which are too less for making isomers.

Answer 2

In this variety of structural isomerism, the isomers contain different functional groups - that is, they belong to different families of compounds (different homologous series). For example, a molecular formula C3H6O could be either propanal (analdehyde) or propanone (a ketone)