The given reaction can occur in the presence of:
$(1)$ Bromine water
$(2)$ $Br_2$ in $CS_2, 273 \ K$
$(3)$ $Br_2 / FeBr_3$
$(4)$ $Br_2$ in $CHCl_3, 273 \ K$
Choose the correct answer from the options given below:
[Image: Phenol reacting to form p-bromophenol as the major product]

  • A
    $(1)$ and $(3)$ only
  • B
    $(2)$,$(3)$ and $(4)$ only
  • C
    $(1)$,$(2)$ and $(4)$ only
  • D
    $(2)$ and $(4)$ only

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The major product formed in the following reaction is:

$A$ solution of phenol in chloroform when treated with aqueous $NaOH$ gives compound $P$ as a major product. The mass percentage of carbon in $P$ is $..............$ (to the nearest integer)
(Atomic mass : $C = 12$; $H = 1$; $O = 16$)

Phenol $\xrightarrow[(ii) CO_2 / 140^{\circ}C]{(i) NaOH} A$ $\xrightarrow{H^{+} / H_2O} B$ $\xrightarrow[CH_3COOH, \Delta]{Al_2O_3} C$
In this reaction,the end product $C$ is :

Difficult
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Explain why nucleophilic substitution reactions are not very common in phenol.

The Reimer-Tiemann reaction introduces an aldehyde group onto the aromatic ring of phenol,ortho to the hydroxyl group. This reaction involves electrophilic aromatic substitution. This is a general method for the synthesis of substituted salicylaldehydes as depicted below.
$1.$ Which one of the following reagents is used in the above reaction?
$A.$ aq. $NaOH + CH_3Cl$
$B.$ aq. $NaOH + CH_2Cl_2$
$C.$ aq. $NaOH + CHCl_3$
$D.$ aq. $NaOH + CCl_4$
$2.$ The electrophile in this reaction is
$A.$ $:CHCl$
$B.$ $^{+}CHCl_2$
$C.$ $:CCl_2$
$D.$ $CCl_3^{-}$
$3.$ The structure of the intermediate $I$ is
(See provided image for structures $A$,$B$,$C$,$D$)
Give the answer for questions $1, 2$ and $3.$

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