A) \[NaCNS\]
B) \[N{{H}_{2}}CSN{{H}_{2}}\]
C) \[N{{H}_{2}}CON{{H}_{2}}\]
D)
Correct Answer: B
Solution :
In Lassaigne test of nitrogen, sometimes red colour appears. It is due to the presence of both N and S in the organic compound. When both of these are present, these changes into NaCNS during sodium extract preparation which give \[Fe{{(CNS)}_{3}}\] with \[FeC{{l}_{3}}\] solution. Hence, thio-urea will give blood red colour in Lassaigne test. \[Na+C+N+S\xrightarrow{{}}NaCNS\] \[FeC{{l}_{3}}+3NaCNS\xrightarrow{{}}\underset{\text{blood}\,\,\text{red}}{\mathop{Fe{{(CNS)}_{3}}}}\,+3NaCl\]
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