Question

Propanone and Propanal are:

• A. Position isomers
• B. Functional isomers
• C. Chain isomers
• D. Geometrical isomers

Hint:

Propanone and Propanal are functional isomers with different groups: ketone and aldehyde.

Answer 1

The Correct Option is B

The question asks us to identify the type of isomerism displayed by Propanone and Propanal. Let's analyze the options to determine which type of isomerism fits.

1. Understanding Isomerism: Isomerism occurs when two or more compounds have the same molecular formula but different structural formulas or arrangements. 
2. Propanone and Propanal:
   • \(\text{Propanone: CH}_3\text{COCH}_3\) (also known as Acetone)
   • \(\text{Propanal: CH}_3\text{CH}_2\text{CHO}\)
3. Types of Isomerism:
   • Position Isomers: Compounds with the same molecular formula but different positions of the functional group or substituents on the same carbon skeleton. Propanone and Propanal do not have the same carbon skeleton.
   • Functional Isomers: Compounds with the same molecular formula but different functional groups. Propanone contains a ketone group, whereas Propanal contains an aldehyde group. Thus, Propanone and Propanal are functional isomers.
   • Chain Isomers: Compounds with the same molecular formula but different arrangements of the carbon chain. Both Propanone and Propanal have three carbon atoms but differ in functional group type, not chain arrangement.
   • Geometrical Isomers: Compounds with the same structural formula but differ in spatial orientation of groups about a double bond or ring. Propanone and Propanal do not exhibit geometrical isomerism.
4. Conclusion: Based on the analysis, Propanone and Propanal are functional isomers because they share the same molecular formula but have different functional groups (ketone and aldehyde).