$$\begin{gathered} \text{ Isomeric amines with molecular formula }{\mathrm{C}}_8{\mathrm{H}}_{11}\mathrm{N}\text{ give the following tests } \\ \text{ Isomer }\left(\mathrm{P}\right)\Rightarrow \text{ Can be prepared by Gabriel phthalimide synthesis } \\ \text{ Isomer }\left(\mathrm{Q}\right)\Rightarrow \text{ Reacts with Hinsberg's reagent to give solid insoluble in }\mathrm{NaOH} \\ \text{ Isomer }\left(\mathrm{R}\right)\Rightarrow \text{ Reacts with HONO followed by }\mathrm{\beta }\text{ - naphthol in }\mathrm{NaOH}\text{ to give red dye. } \\ \text{ Isomer }\left(\mathrm{P}\right),\left(\mathrm{Q}\right)\text{ and }\left(\mathrm{R}\right)\text{ respectively are } \end{gathered}$$