A) Perkin's reaction
B) Fries reaction
C) Libermann nitroso reaction
D) Etard reaction
Correct Answer: C
Solution :
Nitrosoamine on heating with cone.\[{{\text{H}}_{\text{2}}}\text{S}{{\text{O}}_{\text{4}}}\] gives secondary amine. This reaction is called Libermann nitroso reaction. \[\underset{\text{nitrosoamine}}{\mathop{{{R}_{2}}N-N=O}}\,+{{H}_{2}}O\,+{{H}_{2}}O\xrightarrow{conc.{{H}_{2}}S{{O}_{4}}}\underset{\begin{smallmatrix} \text{secondary} \\ \,\,\,\,\text{amine} \\ \text{+HN}{{\text{O}}_{\text{2}}} \end{smallmatrix}}{\mathop{{{R}_{2}}NH}}\,\]
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