$\begin{array}{1 1} \text{Trimethyl amines form a soluble compound with Hinsberg reagent and kolt} \\ \text{Dimethylamines react with KOH and phenol to form an azo dye} \\ \text{Methylamine reacts with nitrous acid and liberates} N_2 \;from\;aq.solution \\ \text{$None\; of\; these$ } \end{array} $
