A) \[{{C}_{6}}{{H}_{5}}N{{O}_{2}}\]
B) pyridine
C) \[{{C}_{6}}{{H}_{5}}-N=N-{{C}_{6}}{{H}_{5}}\]
D) \[{{C}_{6}}{{H}_{5}}N{{H}_{2}}\]
Correct Answer: D
Solution :
In nitro and azo compounds or cyclic compounds (in which nitrogen is part of ring) nitrogen is not completely converted ino \[{{\text{(N}{{\text{H}}_{\text{4}}}\text{)}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\] during digestion. Thus, Kjeldahls method does not work for such compounds.
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