In which of the following compounds can the $X^{-}$ atom be most easily substituted by a stronger nucleophile?

Which of the following is least reactive towards $S_NAr$?

In chlorobenzene,the $-Cl$ group is deactivating; however,it still undergoes electrophilic aromatic substitution reactions. Column-$(I)$ contains the reagents and Column-$(II)$ contains the products. Match Column-$(I)$ with Column-$(II)$.
| Column-$(I)$ (Reagents) | Column-$(II)$ (Products) |
| :--- | :--- |
| $(A)$ $Cl_2$ / anhydrous $AlCl_3$ | $(i)$ $1$-chloro-$2$-methylbenzene + $1$-chloro-$4$-methylbenzene |
| $(B)$ conc. $HNO_3$ + conc. $H_2SO_4$ | $(ii)$ $2$-chlorobenzenesulfonic acid + $4$-chlorobenzenesulfonic acid |
| $(C)$ conc. $H_2SO_4$ and heat | $(iii)$ $1,2$-dichlorobenzene + $1,4$-dichlorobenzene |
| $(D)$ $CH_3COCl$ in presence of anhydrous $AlCl_3$ | $(iv)$ $2$-chloroacetophenone + $4$-chloroacetophenone |
| | $(v)$ $1$-chloro-$2$-nitrobenzene + $1$-chloro-$4$-nitrobenzene |

Which of the following chlorides is the least reactive towards hydrolysis?

Number of compounds from the following which cannot undergo Friedel-Crafts reactions is ............ toluene,nitrobenzene,xylene,cumene,aniline,chlorobenzene,$m$-nitroaniline,$m$-dinitrobenzene

What will be the product of the following reaction?
$1$-chloro-$2,4$-dinitrobenzene + $CH_3ONa \xrightarrow{\Delta} \text{Product}$