Boiling ethylamine on reaction with acidified $KMnO_4$ gives:

Which among the following compounds is the weakest base?

The basic character of amines can be explained by which of the following theories?

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

Identify what is $Y$ in the following reaction sequence?
$CH_3CONH_2$ $\xrightarrow{Br_2/NaOH(aq)} X$ $\xrightarrow[(ii) H_2O]{(i) NaNO_2 + HCl} Y$

Identify an aromatic,mixed,$3^{\circ}$ amine from the following.