$CH_3COOH$ $\xrightarrow[\Delta ]{NH_3} X$ $\xrightarrow{NaOBr} Y$ $\xrightarrow{NaNO_2 + HCl} Z$. What is $Z$?

The product$(s)$ of the following reaction sequence is(are):
Aniline $\xrightarrow[\text{ii) } KBrO_3/HBr]{\text{i) Acetic anhydride/pyridine}}$ $\xrightarrow[\text{iv) } NaNO_2/HCl, 273-278 \ K]{\text{iii) } H_3O^+, \text{heat}}$ $\xrightarrow{\text{v) } Cu/HBr} \text{Product}$

Consider the following sequence of reactions: $C_2H_5-Br$ $\xrightarrow{AgCN} A$ $\xrightarrow{H_2/Ni} B$. Product $B$ is:

$R-CONH_2 \xrightarrow[\Delta]{KOBr} R-NH_2$. The correct statement about the product is:

Consider the following sequence of reactions:
$C_6H_5NH_2$ $\xrightarrow{NaNO_2, 0-5^{\circ}C} 'A'$ $\xrightarrow{N,N-\text{Dimethylaniline}} 'B'$
The product $B$ is

Arrange the following bases in decreasing order of basicity:
$(i)$ Aniline
$(ii)$ $o$-nitroaniline
$(iii)$ $m$-nitroaniline
$(iv)$ $p$-nitroaniline