Identify the reagent used for the conversion of aniline to phenol from the following.

The major product in the above reaction is:

The products $A$ and $B$ formed in the following reaction scheme are respectively:

Compound $A$ is converted to $B$ on reaction with $CHCl_3$ and $KOH$. The compound $B$ is toxic and can be decomposed by $C$. $A, B$ and $C$ respectively are:

Isomeric amines with molecular formula $C_8H_{11}N$ give the following tests:
Isomer $(P) \Rightarrow$ Can be prepared by Gabriel phthalimide synthesis.
Isomer $(Q) \Rightarrow$ Reacts with Hinsberg's reagent to give a solid insoluble in $NaOH$.
Isomer $(R) \Rightarrow$ Reacts with $HONO$ followed by $\beta$-naphthol in $NaOH$ to give a red dye.
Isomers $(P), (Q)$ and $(R)$ respectively are:

Succinic acid $\xrightarrow{\Delta } (A)$ $\xrightarrow[\Delta ]{NH_3} (B)$ $\xrightarrow[KOH]{Br_2} (C);$ Product $(C)$ will be