$p-$Nitrotoluene on further nitration gives :

The reaction in which $2$ molecules of chlorobenzene react with metallic sodium in the presence of dry ether to form diphenyl is an example of:

The reaction of toluene with $Cl_2$ in the presence of $FeCl_3$ gives predominantly

Trichloroacetaldehyde,$CCl_3CHO$,reacts with chlorobenzene in the presence of sulphuric acid and produces:

Aryl halides are less reactive towards nucleophilic substitution reactions compared to alkyl halides because of:

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