Among the following species, which has the maximum number of resonating structures?

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${SO}_{4}^{2 -}$

${AsO}_{3}^{3 -}$

${MnO}_{4}$

${PO}_{4}^{3 -}$

answer is B.

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Detailed Solution

Resonance in reference to the valence bond theory describes the delocalization of electrons within molecules.

opt (2)

We can find the species with the maximum number of resonating structures by drawing their resonating structures like given in the image below.

Thus,

${SO}_{4}^{2 -}$ has the maximum number of resonating structures i.e. 6

opt (1)

We can find the species with the maximum number of resonating structures by drawing their resonating structures like given in the image below.

Thus,

${PO}_{4}^{3 -}$ has only 4 as the maximum number of resonating structures.

opt (3)

We can find the species with the maximum number of resonating structures by drawing their resonating structures like given in the image below.

Thus,

${AsO}_{4}^{3 -}$ has only $4$ as the maximum number of resonating structures.

opt (4)

We can find the species with the maximum number of resonating structures by drawing their resonating structures like given in the image below.

Thus,

${MnO}_{4}^{-}$ has only 4 as the maximum number of resonating structures.

${SO}_{4}^{2 -}$ has the maximum number of resonating structures.

Thus, opt (2) is the correct answer.

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