The major product formed in the Friedel-Crafts acylation of chlorobenzene is $p-$chloroacetophenone. Identify the correct structure of the major product.

The decreasing order of reactivity of $meta$-nitro-bromobenzene $(I)$,$2,4,6$-trinitro-bromobenzene $(II)$,$para$-nitro-bromobenzene $(III)$,and $2,4$-dinitro-bromobenzene $(IV)$ towards $HO^-$ ions is:

$o$-Toluic acid on reaction with $Br_2 + Fe$ gives:

Which of the following represents a nucleophilic aromatic substitution reaction?

In a reaction of $C_6H_5Y$,the major product obtained is the $60\%$ isomer. What is the group $Y$?

What is the product $X$ in the following Wurtz-Fittig reaction?