In which of the following compounds does electrophilic attack occur at ortho and para positions?

Aryl halides are extremely less reactive towards nucleophilic substitution. Predict and explain the order of reactivity of the following compounds towards nucleophilic substitution:
$(I)$ $p$-nitrochlorobenzene
$(II)$ $2,4$-dinitrochlorobenzene
$(III)$ $2,4,6$-trinitrochlorobenzene

The major product obtained on the monobromination (with $Br_2/FeBr_3$) of the following compound $A$ is

$A$ solution of cyclohexene in benzene is stirred at $0 \ ^oC$ while concentrated sulphuric acid is added. After washing away the acid and removing the excess benzene,what product is isolated?

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 correct order of reactivity of the following haloarenes towards nucleophilic substitution with aqueous $NaOH$ is:
Choose the correct answer from the options given below: