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MissPhiladelphia
You should remember that a pi bond is related to an alkene, compounds that have a double bond. Among the choices, the only compound that has a double bond is the CO3^2-. Since it is an ion, the pi electrons are delocalized, meaning, their location cannot be indicated as they rotate around the molecules. This is a result of following the octet rule.
PBCHEM

Answer : Option D) [tex] CO_{3} [/tex].

Explanation : A delocalized π bond are those π bonds in which the electrons are allowed to move freely over more than two nuclei. So, amongst the given molecules [tex] CO_{3} [/tex] is the correct answer. As [tex] CO_{3} [/tex] is a molecule which shares a π bond between one carbon and three oxygen atom. The electrons move freely over the whole molecule.

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