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

In the reaction of $p$-chlorotoluene with $KNH_2$ in liquid $NH_3$,what is the major product?

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

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

Arrange the following compounds in decreasing order of their reactivity towards electrophilic substitution $(S_E)$ reaction: $I$. Chlorobenzene,$II$. Benzene,$III$. Anilinium chloride,$IV$. Toluene.

Which of the following is not used in the Friedel-Crafts reaction?