Compounds Containing Nitrogen

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