A) \[NaCN\]
B) \[\overset{\begin{smallmatrix} S \\ || \end{smallmatrix}}{\mathop{N{{H}_{2}}-C-N{{H}_{2}}}}\,\]
C) \[\overset{\begin{smallmatrix} O \\ || \end{smallmatrix}}{\mathop{N{{H}_{2}}-C-N{{H}_{2}}}}\,\]
D) None of these
Correct Answer: B
Solution :
In the Lassaigne's test, if organic compound consists of both N and S then a red colour is obtained on adding aqueous\[FeC{{l}_{3}}\]\[\overset{\begin{smallmatrix} S \\ || \end{smallmatrix}}{\mathop{N{{H}_{2}}-C-N{{H}_{2}}}}\,\] to sodium extract contains both N and S hence, it will give red colour in Lassaigne test. \[NaCNS+FeC{{l}_{3}}\to \underset{blood\,red\,colour}{\mathop{[Fe(SCN)]C{{l}_{2}}+NaCl}}\,\]
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