Ncert Exercises & Solutions

Consider the following four compounds.

(I)

(II)

(III)

(1V)

Which of the following pairs are position isomers?

1. I and II

2. II and III

3. II and IV

4. III and IV

Hint: Position of Functional group is different

When two or more compounds differ in the position of substituent atom or functional group on the carbon skeleton, they are called position isomers.

(II)

(III)

Here, the position of the ketone functional group is varied and the molecular formula is the same. Thus, II and III are position isomers.