What are $Y$ and $Z$ respectively in the following reaction sequence?
Chlorobenzene $\xrightarrow[Conc. H_2SO_4]{HNO_3}$ $X$ (major product) $\xrightarrow{Y}$ $Z$

Identify the best suitable reagent for the following reaction.

Given below are two statements: one is labelled as Assertion $(A)$ and the other is labelled as Reason $(R)$.
Assertion $(A)$ : Chlorine is an electron withdrawing group but it is ortho,para directing in electrophilic aromatic substitution.
Reason $(R)$ : Inductive effect of chlorine destabilises the intermediate carbocation formed during the electrophilic substitution,however due to the more pronounced resonance effect,the halogen stabilises the carbocation at ortho and para positions.
In the light of the above statements,choose the most appropriate answer from the options given below :

Why are aryl halides less reactive towards nucleophilic substitution reactions than alkyl halides? How can we enhance the reactivity of aryl halides?

What is the correct order of reactivity for electrophilic substitution reactions for the following compounds?

The major product obtained in the following reaction is: Chlorobenzene + chlorine $\xrightarrow[FeCl_3]{\text{Anhydrous}}$ product (Major)