Question

Choose the correct statement for the given compounds:

• A. (a) and (b) are not isomers.
• B. (a) and (b) are functional isomers.
• C. (a) and (b) are chain isomers.
• D. (a) and (b) are positional isomers.

Answer 1

The correct option is B (a) and (b) are functional isomers.

(a) is butan-1-al and (b) is butan-2-one
Both (a) and (b) have same molecular formula i.e. $C_4{H}_{8}O$
Aldehyde and ketone are examples of functional isomers.

Theory :
Characteristics of functional isomers :
1.Compounds with the same molecular formula.
2. Compounds with the same general formula.
3.Compounds with the same empirical formula.
4.Compounds with the same molecular weight.
5.Compounds with the same empirical weight.
6.Compounds with the same vapor density.
7.At least one difference in physical/chemical properties
8. Different structural formulae.
9. Different position of multiple bond/ functional group