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(C) The Kjeldahl method is not applicable to compounds containing nitrogen in nitro $(-NO_2)$ groups,azo $(-N=N-)$ groups,or nitrogen present in a het

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Alanine

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(C) The Kjeldahl method is not applicable to compounds containing nitrogen in nitro $(-NO_2)$ groups,azo $(-N=N-)$ groups,or nitrogen present in a heterocyclic ring (like pyridine). In these cases,nitrogen is not quantitatively converted to ammonium sulphate under the reaction conditions. Alanine $(CH_3CH(NH_2)COOH)$ is an amino acid where nitrogen is present as an amino group $(-NH_2)$,which is readily converted to ammonium sulphate. Therefore,the Kjeldahl method is suitable for Alanine.

For which of the following compounds can the Kjeldahl method be used to determine the percentage of nitrogen?

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