Question:medium
Kjeldahl's method cannot be used for the estimation of nitrogen in which compound?
(A) (B) (C) (D) NH2-CH2-COOH C6H5-NH2 C6H5-N=N-C6H5 O2N-C6H4-NO2
Kjeldahl's method cannot be used for the estimation of nitrogen in which compound?
| (A) | (B) | (C) | (D) |
|---|---|---|---|
| NH2-CH2-COOH | C6H5-NH2 | C6H5-N=N-C6H5 | O2N-C6H4-NO2 |
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Key Points:
Kjeldahl's method requires nitrogen to be convertible to ammonium sulfate Works only for nitrogen in $\mathrm{-3$ oxidation state Fails for $\mathrm{N=N$, $\mathrm{NO_2$, $\mathrm{CN$ groups Azobenzene (C) contains stable N=N bonds resistant to digestion
Kjeldahl's method requires nitrogen to be convertible to ammonium sulfate Works only for nitrogen in $\mathrm{-3$ oxidation state Fails for $\mathrm{N=N$, $\mathrm{NO_2$, $\mathrm{CN$ groups Azobenzene (C) contains stable N=N bonds resistant to digestion
Updated On: Nov 28, 2025
- A
- B
- C
- D
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The Correct Option is C
Solution and Explanation
Kjeldahl's method estimates nitrogen in:
- Amino acids (A)
- Amines (B)
- Amides
- Other compounds with nitrogen in a -3 oxidation state
- Azo compounds (C) -N=N-
- Nitro compounds (D, H) -NO2
- Nitriles (E) -CN
- Diazonium salts
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