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