$DDT$ can be prepared by reacting chlorobenzene (in the presence of conc. $H_2SO_4$) with

Aryl halide is less reactive than alkyl halide towards nucleophilic substitution because

The product $(R)$ in the following synthetic scheme is

Arrange the following compounds in the decreasing order of their reactivity towards $OH^-$: $m$-nitrobromobenzene $(I)$,$2,4,6$-trinitrobromobenzene $(II)$,$p$-nitrobromobenzene $(III)$,and $2,4$-dinitrobromobenzene $(IV)$.

What is the increasing order of nucleophilic substitution reaction for the following compounds?
$(I)$ $C_6H_5-CH_3$
$(II)$ $C_6H_6$
$(III)$ $C_6H_5-COOH$

The rate of reaction is maximum if $G$ is:
$Cl-C_6H_4-G \xrightarrow{NaOH, \Delta/P} HO-C_6H_4-G$