A) \[N{{H}_{2}}N{{H}_{2}}\]
B) \[N{{H}_{2}}-\underset{\begin{smallmatrix} || \\ O \end{smallmatrix}}{\mathop{C}}\,-N{{H}_{2}}\]
C) \[C{{H}_{3}}-\underset{\begin{smallmatrix} | \\ SH \end{smallmatrix}}{\mathop{C}}\,-C{{H}_{2}}N{{H}_{2}}\]
D) Both [a] and [b]
Correct Answer: D
Solution :
[d]: Compound with N, S and carbon will form NaSCN to give red ppt. \[Na+C+N+S\xrightarrow[{}]{{}}NaSCN\] \[F{{e}^{3+}}+SC{{N}^{-}}\xrightarrow[{}]{{}}\underset{(Blood\,red)}{\mathop{{{[Fe(SCN)]}^{2+}}}}\,\]
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