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For which substances kjeldahl's method i...

For which substances kjeldahl's method is not useful ?

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**Step-by-Step Solution:** 1. **Understanding Kjeldahl's Method**: - The Kjeldahl method is a widely used technique for determining the nitrogen content in organic compounds. It involves the digestion of the sample with concentrated sulfuric acid, which converts nitrogen into ammonium sulfate. 2. **Identifying the Limitation**: - The method is specifically designed for compounds where nitrogen is present in a form that can be converted to ammonium ions. However, it has limitations when nitrogen is part of a heterocyclic compound. ...
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