Which of the following compounds gives the carbylamine reaction?

Which of the following will release $NH_{3}$ upon reaction with $NaOH$?

For the identification of $\beta$-naphthol using dye test,it is necessary to use :

Compound $P$ is neutral. $Q$ gives effervescence with $NaHCO_3$ while $R$ reacts with Hinsberg's reagent to give a solid soluble in $NaOH$. Compound $P$ is:

Which of the following compounds gives a positive carbylamine test?

Secondary nitro compounds when react with $HNO_2$ form crystalline solids which on treatment with $NaOH$ give