Question

a. Which of the following compounds have delocalized electrons?

b. Draw the resonance contributors for the compounds that have delocalized electrons.

1.CH₂=CHCH₂CH=CH₂

2.CH₃CH=CHCH=CHCH₂

Short answer

a) 2,4 and 5 have delocalized electrons.

Step-by-step solution

Reason behind no delocalizaton of electrons in 1,3,6 and 7

1. Because π electrons cannot move towards sp³ carbon.

2. 3,6 and 7 do not have delocalized electrons because lone pair electrons cannot move towards sp³ carbon.

Final answer

a) 2,4 and 5 have delocalized electrons.