A) \[{{1}^{o}}\]amine
B) \[{{2}^{o}}\]amine
C) \[{{3}^{o}}\]amine
D) quaternary amine
Correct Answer: B
Solution :
Leibermanns nitroso reaction is used for the test of secondary amine. Secondary amines on reaction with nitrous acid to give yellow oily nitrosoamines. The yellow oily nitrosoamine gives a green solution when warmed with phenol and cone. \[{{H}_{2}}S{{O}_{4}}\].On dilution with water, the colour changes to red and further, changes to blue or violet with alkali. The overall reaction is called Leibermanns nitroso reaction. \[\underset{\begin{smallmatrix} secondary \\ \,\,\,amine \end{smallmatrix}}{\mathop{{{R}_{2}}NH}}\,+HN{{O}_{2}}\xrightarrow{{}}\underset{nitrosoamine}{\mathop{{{R}_{2}}N-N=O}}\,+{{H}_{2}}O\]
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