Which structure is the most stable (lowest energy) resonance contributor?

A. The structure with the positive charge on nitrogen and negative charges on sulfur and carbon.
B. The structure with the positive charge on nitrogen and negative charges on oxygen and sulfur.
C. All structures are equal in stability.
D. The structure with the positive charge on nitrogen and negative charges on oxygen and carbon.

The most stable (lowest energy) resonance contributor is the structure with the positive charge on nitrogen and negative charges on oxygen and sulfur. The correct option is B.

This is because resonance structures with charges distributed on more electronegative atoms, like oxygen and sulfur, tend to be more stable. Electronegative atoms can better accommodate negative charges due to their high electron affinity, leading to increased stability.

Nitrogen, being less electronegative than oxygen, is better suited to carry the positive charge. Therefore, among the given options, option b has the most stable charge distribution, making it the most stable resonance contributor. The correct option is B.

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