In which of the following compounds delocalisation is not possible

1) H₂C ═ CH – CH₂ – HC ═ CH₂

Resonance is not possible [delocalisation of π-electrons] Since the π-bonds are isolated and they are non conjugated.

2)

Resonance [delocalisation of π e-s] is possible, since it is a conjugated system.

Resonance [delocalisation of π e-s] is possible, since it is also a conjugated system.

Resonance is possible, since it is also a conjugated system.