Question

Identify the pairs of functional isomers.

• A. Propanal, Propanone
• B. Propanal, Butane
• C. Ethane, Methane
• D. None of these

Answer 1

Answer: (A)

Propanal, Propanone

Propanal ($C{H}_3-C{H}_2-\underset{\underset{O}{||}}{C}-H$) and propanone ($C{H}_3-\underset{\underset{O}{||}}{C}-C{H}_3$) represents the pairs of functional isomers. They have same molecular formula but different functional groups. Propanal contains aldehdye group and propanone contains keto group.

Propanal and butane are not isomers as they have different molecular formula.

Similarly, ethane and methane are not isomers as they have the different molecular formulas.