Which of the following can be analysed correctly for nitrogen by the Kjeldahl method?

A $C X_{6} H X_{5} NH X_{2}$
B $C X_{6} H X_{5} N = NC X_{6} H X_{5}$
Cpyridine, $C X_{5} H X_{5} N$
D $C X_{6} H X_{5} NO X_{2}$

Answer: A

Kjeldahl digestion converts amine and amide nitrogen into ammonium sulphate. Azo compounds, ring nitrogen (pyridine) and nitro compounds are not quantitatively converted to ammonium sulphate, so only aniline is suitable.

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