Which of the following amines is most basic in nature in the aqueous phase?

The increasing basicity order of the following compounds is:
$(1)$ $CH_3CH_2NH_2$
$(2)$ $(CH_3CH_2)_2NH$
$(3)$ $(CH_3)_3N$
$(4)$ $PhNHCH_3$

Given below are two statements:
Statement $I$: Heating benzamide with bromine in an ethanolic solution of sodium hydroxide will give benzylamine.
Statement $II$: Nitration of aniline with $HNO_3/H_2SO_4$ at $288 \ K$ produces $m$-nitroaniline in higher amount than $o$-nitroaniline (pH adjusted).

An organic compound $[A]$ $(C_4H_{11}N)$ shows optical activity and gives $N_2$ gas on treatment with $HNO_2$. The compound $[A]$ reacts with $PhSO_2Cl$ producing a compound which is soluble in $KOH$. The structure of $A$ is:

$RNH_2$ reacts with $C_6H_5SO_2Cl$ (Hinsberg reagent) in aqueous $KOH$ to give a clear solution. On acidification,a precipitate is obtained which is due to the formation of:

Determine the order of basic strength for the following compounds: