When aniline is subjected to extended sulfonation using concentrated sulfuric acid at high temperatures, the product is sulfanilic acid. In what specific unique structural form does this molecule pred

Question

When aniline is subjected to extended sulfonation using concentrated sulfuric acid at high temperatures, the product is sulfanilic acid. In what specific unique structural form does this molecule predominantly exist?

Prashant Kotian · Accepted Answer

Correct answer: C. Sulfanilic acid contains a basic amino group and an acidic sulfonic acid group. An internal proton transfer shifts the acidic proton to the basic nitrogen, forming a highly stable, highly polar dipolar salt known as a zwitterion.

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