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

Given below are two statements:

Statement I : Aqueous solution of K$$_2$$Cr$$_2$$O$$_7$$ is preferred as a primary standard in volumetric analysis over Na$$_2$$Cr$$_2$$O$$_7$$ aqueous solution.

Statement II : K$$_2$$Cr$$_2$$O$$_7$$ has a higher solubility in water than Na$$_2$$Cr$$_2$$O$$_7$$.

In the light of the above statements, choose the correct answer from the options given below:

Suitable reaction condition for preparation of Methyl phenyl ether is

Identify the correct order of reactivity for the following pairs towards the respective mechanism

Choose the correct answer from the options given below: