Delocalized Pi Electrons in Molecules

In this problem, we need to determine which of the three given molecules have delocalized pi electrons. This means looking for structures that can be represented by resonance hybrids.

Delocalized pi electrons occur when pi electrons are shared between more than two nuclei, typically found in systems with alternating single and multi-bonds, or specific structures like benzene and ozone.

Let's examine the first molecule, benzene, which is C six H six. It is a classic example of delocalization.

In benzene, the electrons are not fixed in specific double bonds but are spread across the entire hexagonal ring. So, molecule one definitely has delocalized pi electrons.

Next, let's look at ethanoic acid, C H three C O O H.