Identify the product $B$ in the following reaction:
$C_6H_5NH_2$ $\xrightarrow[0^\circ-5^\circ C]{NaNO_2/HCl} A$ $\xrightarrow{Ph-N(CH_3)_2} B$

  • A
    $4-$(Dimethylamino)biphenyl
  • B
    $4-$(Dimethylamino)phenol
  • C
    $4-$(Dimethylamino)-$4$'-aminobiphenyl
  • D
    $N,N$-Dimethyl$-4-$phenylazoaniline

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Product $D$ is:-

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Product $(E)$ is

Product $(B)$ of this reaction is:

$A$ is a neutral organic compound $(M.F.: C_8H_9ON)$. On treatment with aqueous $Br_2 / HO^{(-)}$, $A$ forms a compound $B$ which is soluble in dilute acid. $B$ on treatment with aqueous $NaNO_2 / HCl$ $(0-5^{\circ}C)$ produces a compound $C$ which on treatment with $CuCN / NaCN$ produces $D$. Hydrolysis of $D$ produces $E$ which is also obtainable from the hydrolysis of $A$. $E$ on treatment with acidified $KMnO_4$ produces $F$. $F$ contains two different types of hydrogen atoms. The structure of $A$ is

The product $(B)$ is:

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