D
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In the mock test provided by the oat company there is a mistake. Question 89 on natural science section. The answer is A/E not D. The aromaticity doesn't contribute to the acidity. The lone pair of the indicated nitrogen are already contributed to the rings aromaticity and the extra lone pairs don't contribute. The Sp2 carbons/nitrogen suck up e density from the nitrogen via inductive effect/hyperconjugation and that is why it is acidic. I've taken master level orgo course and know my orgo. The link to the test is here https://www.ada.org/~/media/OAT/Files/oat_sample_test.pdf?la=en
