In which of the following compounds, nitrogen cannot be tested by Lassaigne's test?....

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In which of the following compounds, nitrogen cannot be tested by Lassaigne's test?
\( \mathrm{P} \)
(1) \( \mathrm{CH}_{3} \mathrm{CONH}_{2} \)
W
(2) \( \mathrm{NH}_{2} \cdot \mathrm{NH}_{2} \cdot \mathrm{H}_{2} \mathrm{O} \)
(3) \( \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2} \)
(4) \( \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NO}_{2} \)


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