Conjugated double bond is present in

Options

A. 1, 2-butadiene
B. 1, 3-butadiene
C. 1, 3-pentadiene
D. `beta`-butylene

Answer

B, C

Explanation

`underset(1) (C ) H_(2) = underset(2) (C )H - underset(3) (C )H = underset(4) ( C) H_(2)` 1 , 3 -butadiene
`underset(1) (C )H_(2) = underset(2) ( C) H- underset(3) ( C) H = underset(4)( C) H_(2) - underset(5) ( C) H_(3)` 1, 3-pentadiene
Molecules having alternate single and double bonds are called conjugated system.