Which of the following has the highest normal boiling point?

$A$ major component of Borsch reagent is obtained by reacting hydrazine hydrate with which of the following?

Which of the following compounds undergoes electrophilic substitution slower than benzene?

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 :

The product $(A)$ of the reaction is:

The correct order of reactivity for reactions involving the cleavage of the $C-Cl$ bond in the following compounds is: