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

A

B

C

D