Kjeldahl method can not be used to detect \( \% \mathrm{~N} \) in which of the following compoun...

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Kjeldahl method can not be used to detect \( \% \mathrm{~N} \) in which of the following compounds.
\( \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{NH}_{2}, \mathrm{C}_{5} \mathrm{H}_{5} \mathrm{~N} \) (Pyridine), \( \mathrm{C}_{4} \mathrm{H}_{5} \mathrm{~N} \) (pyrole), \( \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NO}_{2} \),
\( \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2}, \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{~N}_{2}^{+} \mathrm{Cl}, \mathrm{Ph}-\mathrm{N}=\mathrm{N}-\mathrm{Ph},\left(\mathrm{CH}_{3}\right)_{2} \mathrm{NH}, \mathrm{CH}_{3} \mathrm{CN} \)
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