Let's study chemistry - 9
Qualitative analysis of Nitrogen is done by making first Lassinge extract and then adding Fe in Conc. Sulphuric acid if that particular organic compound contain nitrogen(and not S) then solution turn purrsian blue.For Quantitative analysis Kjeldahl method is used . First Sulphuric acid is added to organic compound which will form ammonium sulphate. NaOH is further added to ammonium sulphate which gives ammonia ,water and sodium sulphate as a product .The liberated ammonia gas is absorbed in an excess of standard solution of sulphuric acid.The amount of ammonia produced is determined by estimating the amount of sulphuric acid consumed.
(The theory above has no such significance for the question provided)
In which of the following can we apply Kjeldhal method? Assume we do not have a lot of time to spend on.
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Kjeldahl method is not applicable to compounds containing nitrogen in nitro and azo groups and nitrogen present in rings (e.g. pyridine) as nitrogen of these compounds does not convert to ammonium sulfate under the conditions of this method (extracts from Kjeldhal method ).
Pyrrole and pyridine have nitrogen present in rings and 2-nitro-hexanoic acid belongs to the nitro group, therefore, none of these choices can apply Kjeldhal method, unless we take time to decompose them.