A) \[{{C}_{6}}{{H}_{5}}N{{H}_{2}}\]
B) \[N{{H}_{2}}-\overset{S}{\mathop{\overset{||}{\mathop{C}}\,}}\,-N{{H}_{2}}\]
C) \[N{{H}_{2}}-\overset{O}{\mathop{\overset{||}{\mathop{C}}\,}}\,-N{{H}_{2}}\]
D) None of these
Correct Answer: B
Solution :
If both nitrogen and sulphur are present in a organic compound, they will give red blood colour with Lassaigne test due to the formation of ferric thiocyanate. \[Na+C+S+N\xrightarrow{\Delta }\underset{sodium.\,thiocyanate}{\mathop{NaSCN}}\,\] \[F{{e}^{3+}}+3NaSCN\xrightarrow{{}}\underset{\begin{smallmatrix} ferric\,thiocyanate \\ (blood\,red\,colouration) \end{smallmatrix}}{\mathop{Fe{{(SCN)}_{3}}}}\,+3N{{a}^{+}}\]
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