Which of the following pairs is an example of position isomerism?

Options

A. `CH_(3)-CH_(2)-CH_(2)-CH_(3)` and `CH_(3)-underset(CH_(3))underset(|)(CH)-CH_(3)`
B. `CH_(3)-CH_(2)-CH=CH_(2)` and `CH_(3)-CH=CH-CH_(3)`
C. `CH_(3)-CH_(2OH` and `CH_(3)-O-CH_(3)`
D. `CH_(3)-overset(CH_(3))overset(|)underset(CH_(3))underset(|)(C)-CH_(3)` and `CH_(3)-CH_(2)-CH_(2)-CH_(2)-CH_(3)`

Answer

B

Explanation

`CH_(3)-underset("1-butane")(CH_(2))-CH=CH_(2)` and `CH_(3)-underset("2-butane")(CH)=CH-CH_(3)`