Identify the compound from the following having the highest basic strength.

Arrange the following compounds in the increasing order of their basic strength:

Given below are two statements :
Statement $I$: Aniline reacts with conc. $H_2SO_4$ followed by heating at $453-473 \ K$ to give $p$-aminobenzene sulphonic acid (sulphanilic acid). This compound contains both nitrogen and sulphur,and thus it gives a blood red colour in the 'Lassaigne's test' due to the formation of ferric thiocyanate,$[Fe(SCN)]^{2+}$.
Statement $II$: In Friedel-Craft's alkylation and acylation reactions,aniline forms a salt with the $AlCl_3$ catalyst. Due to this,the nitrogen atom of aniline acquires a positive charge and acts as a deactivating group,preventing further reaction.
In the light of the above statements,choose the correct answer from the options given below :

The decreasing order of basicity of the following amines is:
$(I)$ Aniline
$(II)$ Pyridine
$(III)$ Cyclohexylamine
$(IV)$ Pyrrole

Identify the product $Z$ in the following reaction:
$C_6H_5NH_2$ $\xrightarrow{(Ac)_2O} X$ $\xrightarrow{Br_2/CCl_4} Y$ $\xrightarrow{HOH} Z$

The reaction of aniline with chloroform and alcoholic $KOH$ yields .....