Question

For which type of compounds is kjeldahl's method not applicable?

Answer 1

It is not applicable for nitro compounds.

Answer 2

Kjeldahl's method is not applicable for nitrogen compounds present in ring ( for eg: pyridine), in case of nitro compounds such as nitro benzene and all compounds with azo groups(N=N), Since these compounds are not completely converted into (NH4)2SO4 during digestion.