Which of the following cannot give the carbylamine reaction?

Which of the following amines will give the carbylamine test?

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 amine does not react with Hinsberg reagent?

The amine that reacts with Hinsberg's reagent to give an alkali-insoluble product is:

The Hinsberg's method is used for