The above structure exhibits three rings. Identify which of the rings are aromatic. Enter the numbers in ascending order separated by a comma (e. g. 1,2,3). Identify which lone pairs are participating in resonance (in aromatic rings). One lone pair on each of the nitrogen atoms and one lone pair on each of the OH groups. One lone pair on the sulfur atom. One lone pair on the sulfur atom and one lone pair on the OH group. One lone pair on each of the sulfur atoms and one lone pair on each of the OH groups

The aromatic ringsare the number 1 and 2.

Identify which lone pairs are participating in resonance (in aromatic rings).

One lone pair on the sulfur atom.

Explanation:

For a compound to be aromatic it has to comply with Hückel's Rule, which says that the quantity of electrons in the pi orbitals, has to be a multiple of

4n + 2

for n = 0, 1, 2, 3.

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