Question

Acetaldehyde and acetone are isomers.

• A. Metamerism
• B. Functional isomerism

Answer 1

The correct option is B Functional isomerism

Compounds having the same molecular formula but different physical and chemical properties are called isomers.
Acetaldehyde and acetone are not isomers because their molecular formula is different.
The molecular formula of acetaldehyde is $C_2{H}_{4}O$ and that of acetone is $C_3{H}_{6}O$.