**Assertion (A):** Kjeldahl's method cannot be used to estimate nitrogen in pyridine. **Reason (R):** Nitrogen present in the heterocyclic ring of pyridine does not get converted to ammonium sulphate

Question

**Assertion (A):** Kjeldahl's method cannot be used to estimate nitrogen in pyridine. **Reason (R):** Nitrogen present in the heterocyclic ring of pyridine does not get converted to ammonium sulphate during acid digestion.

Prashant Kotian · Accepted Answer

Correct answer: A. Kjeldahl's method requires the organic nitrogen to be quantitatively reduced to the ammonium ion () upon heating with concentrated . Nitrogen tightly bound within an aromatic heterocyclic ring (like pyridine or quinoline) resists this degradation.

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