Nitrogen can be estimated by Kjeldahl's method for which of the following compounds?

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Step 1: Recall Limitations of Kjeldahl's Method

Kjeldahl's method CANNOT estimate nitrogen in compounds where nitrogen is:
- In a nitro group (): too oxidised, does not convert to 
- In a nitrile group (): ring-strain nitrile nitrogen doesn't convert well
- In an azo group (): N–N bonds are not cleaved under Kjeldahl conditions
- In heteroaromatic rings (pyridine, quinoline): aromatic C–N bonds too stable
- In diazonium salts: unstable and reactive differently

Kjeldahl's method WORKS for:
- Am

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