Question

Propanal and propanone are:
A. Functional isomers
B. Position isomers
C. tautomers
D. None of the above

Answer 1

Hint: Here, in this question, propanal and propanone is given. We have to identify the relationship between them. Propanone is a ketone, whereas propanal is an aldehyde.

Complete Step by Step Solution:
Isomers are compounds with the same molecular formula but distinct structural formulae.
Isomers differ not only in structural formula but also in physical and chemical characteristics.
Positional isomerism – Positional isomers are structural isomers that differ in the location of substituents, functional groups, or numerous bonds, and this phenomenon is known as positional isomerism.
Tautomerism isomerism – Tautomers are structural isomers that differ in the location of hydrogen atoms, protons, or electrons, and this phenomenon is referred to as tautomerism. Desmotropism is another name for it. Tautomers exist in a condition of balance with one another because they are easily interconvertible.
Functional Isomerism – Functional isomers are compounds with the same chemical formula but distinct functional groups, and this phenomenon is referred to as functional isomerism or functional group isomerism.
The chemical formula of propanal and propanone is \[{C_3}{H_6}O\].
The structural formula of propanal is as below:

The structural formula of propanone is as below:
From the structures, we can say that propanal and propanone are functional isomers. They have a different structural formula and functional group but the same chemical formula.
Therefore, the correct answer is option A. functional isomers.

Note: Isomerism is a phenomenon in organic chemistry that occurs when two or more organic compounds have the same molecular formula but distinct characteristics due to differences in atom arrangement along with the carbon skeleton (structural isomerism) or in space (space isomerism or Stereoisomerism).