Conversion of $X$ to $Y$ in the above reaction is

For the reaction shown,the best combination of reactants to obtain $o$-bromonitrobenzene is:

Which of the following reasons support that aryl halides are less reactive than alkyl halides towards nucleophilic substitution reactions?
$a)$ The formation of more stable arenium ion
$b)$ Partial double bond character of $C-X$ bond
$c)$ Longer $C-X$ bond
$d)$ $sp^2$ carbon bonded to $X$ is more electronegative

Consider the following compounds:
$a$: Chlorobenzene
$b$: Nitrobenzene
$c$: Anisole
Arrange these compounds in the increasing order of reactivity towards electrophilic aromatic substitution (nitration).

With respect to chlorobenzene,which of the following statements is not correct?

Which of the following is the least reactive in the case of bromination?