Chlorobenzene reacts with trichloroacetaldehyde (chloral) in the presence of $H_2SO_4$.
$2 C_6H_5Cl + CCl_3CHO \xrightarrow{H_2SO_4} \text{Major Product}$
The major product formed is:

Which among the following statements is true about the reactivity of haloarenes towards nucleophilic substitution reactions?
$1$. Haloarenes are very reactive towards nucleophilic substitution reaction.
$2$. In haloarenes,the $C-X$ bond acquires partial double bond character.
$3$. The $C-X$ bond in haloarenes is longer than the $C-X$ bond in haloalkanes.
$4$. In haloarenes,the phenyl cation formed as a result of self-ionisation is stable.

The correct order of reactivity for reactions involving the cleavage of the $C-Cl$ bond in the following compounds is:

In the given reaction,$A$ can be .... .

Which compound is formed when chlorobenzene is heated with chloral in the presence of concentrated sulfuric acid?

$A$ group which deactivates the benzene ring towards electrophilic substitution but which directs the incoming group principally to the $o-$ and $p-$ positions is