Kjeldahl’s method cannot be used to estimate nitrogen for which of the following compounds?

C_{6} H_{5} N H_{2}

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C H_{3} C H_{2} - C \equiv N

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C_{6} H_{5} N O_{2}

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N H_{2} C O N H_{2}

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Solution

The correct option is C $C_{6} H_{5} N O_{2}$
Kjeldahl’s method measures only nitrogen bound to organic components (proteins, amino acids, nucleic acids and ammonium in the sample.
This method is not suitable for compound containing nitrogen in azo and nitro group or in rings (quinoline, nitrate and nitrite etc.)

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