Question

The given compounds are related as :

• A. Functional isomers
• B. Positional isomers
• C. Chain isomers
• D. They are not isomers

Answer 1

The correct option is B Positional isomers

(a) is pent-1-ene and (b) is pent-2-ene.
Both compounds differ only in the position of multiple bond (here double bond) on the same parent chain. The principal chain is also the same for both (a) and (b) of five carbon atoms.

So, by definiton they are positional isomers