In the Wurtz-Fittig reaction,a compound $X$ reacts with an alkyl halide. What is $X$?

In the Gattermann reaction, which of the following catalysts is used?

$A$ mixture of $1 \, mol$ of benzene and $1 \, mol$ of nitrobenzene is reacted with $1 \, mol$ of acetyl chloride in the presence of $AlCl_3$. The major product$(s)$ is/are

An equimolar mixture of toluene and chlorobenzene is treated with a mixture of conc. $H_{2}SO_{4}$ and conc. $HNO_{3}$. Indicate the correct statement from the following.

The displacement of $Cl$ from chlorobenzene to obtain phenol requires strong reaction conditions. However,the chlorine in $2, 4-$ dinitrochlorobenzene is easily displaced because ................

The increasing order of nitration of the following compounds is:
$(A)$ Aniline
$(B)$ Chlorobenzene
$(C)$ Anisole
$(D)$ Toluene