Assertion (A) . Pent-1-ene and pent-2-ene are position isomers.
Reason (R). Position isomers differ in the position of functional group or a substituent.

Options

A. Both A and R are correct and R is the correct explanation of A
B. Both A and R are correct but R is not the correct explanation of As
C. both A and R are not correct
D. A is not correct but R is correct

Answer

A

Explanation

Both A and R are correct and R is the correct explanation of A.
`underset("Pent-1-ene")(overset(5)(C)H_(3) - overset(4)(C)H_(2) - overset(3)(C)H_(2) - overset(2)(C)H = overset(1)(C)H_(2))`
`underset("Pent-2-ene")(overset(5)(C)H_(3) - overset(4)(C)H_(2) - H overset(3)(C) = overset(2)(C)H - overset(1)(C)H_(3))`
When two or more compounds differ in the position of substituent atom or functional group on the carbon skeleton then it is position isomerism. Double bond is a functional group whose position varies.