A) pyridine
B) hexamethylene diamine
C) propan-1-amine
D) 2-phenylethanamine
Correct Answer: A
Solution :
Kjeldahl method can not be used for compounds having azo groups (?N = N?) nitroso (-NO) azoxy compounds \[\left( -N=\underset{\begin{smallmatrix} \downarrow \\ O \end{smallmatrix}}{\mathop{N}}\,- \right)\]and nitrogen in the ring (pyridine, quinoline etc.) Since, nitrogen in these compounds is not quantitatively converted into ammonium sulphate.
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