c
Out of primary, secondary and tertiary amines, the secondary amines, on reaction with \(HNO_2\), produce yellow oily compounds called nitrosoamines.

\(\underset{({{2}^{0}}\,\,a\min e)}{\mathop{C{{H}_{3}}-NH-C{{H}_{3}}}}\,\,+\,HN{{O}_{2}}\to \)  \(\mathop {\begin{array}{*{20}{c}}
  {NO\,\,\,\,\,\,\,\,\,\,\,\,{\mkern 1mu} \,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
  {|{\mkern 1mu} {\mkern 1mu} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} \,\,\,{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\ 
  {C{H_3} - N - C{H_3} + {H_2}O} 
\end{array}}\limits_{\begin{array}{*{20}{c}}
  {dimethyl{\kern 1pt} {\kern 1pt} nitroso{\kern 1pt} {\kern 1pt} amine} \\ 
  {{\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} {\kern 1pt} (oily)} 
\end{array}} {\mkern 1mu} \)