Which of the following compounds does $NOT$ react with bromine in an alkaline medium?

$X \ g$ of ethylamine is subjected to reaction with $NaNO_2 / HCl$ followed by water; evolved dinitrogen gas which occupied $2.24 \ L$ volume at $STP$. $X$ is . . . . . . $\times 10^{-1} \ g$.

Several factors (steric,electronic,orbital interactions,etc.) can affect the inversion barrier of an amine. In the given pairs,which data is correctly placed?

$4-$Nitrotoluene ($para-$nitrotoluene) on reduction with $Fe / HCl$ and then electrophilic bromination with an excess amount of $Br_2$ gives

In the following compounds,the order of basicity is:
$I$: Piperidine
$II$: Pyridine
$III$: Morpholine
$IV$: Pyrrole

Aniline $\xrightarrow[{{0^{\circ}}C - {5^{\circ}}C}]{{NaNO_2/HCl}}A$ $\xrightarrow{{Ph-N(CH_3)_2}}B$
What is $B$?