Identify $A$ and $B$ in the following reaction sequence:
$C_6H_5NH_2 + CH_3COCl$ $\rightarrow A$ $\xrightarrow{Br_2/H_2O} B$

$CH_3CH_2Br$ $\xrightarrow{AgCN} A$ $\xrightarrow{H_2, Ni} B$. The final product $(B)$ is

The descending order of basicity of the following amines is $:$
$(A)$ Aniline
$(B)$ $p$-Methoxyaniline
$(C)$ $p$-Nitroaniline
$(D)$ Methylamine
$(E)$ Dimethylamine
Choose the correct answer from the options given below $:$

Which statements are True? $A$. In Hoffmann bromamide degradation, $4$ moles of $NaOH$ and $1$ mole of $Br_{2}$ are consumed per mole of an amide. $B$. Hoffmann bromamide reaction is not given by alkyl amides. $C$. Primary amines can be synthesized by Hoffmann bromamide degradation. $D$. Secondary amide on reaction with $Br_{2}$ and $NaOH$ will give secondary amine. $E$. The by-products of Hoffmann degradation are $Na_{2}CO_{3}$, $NaBr$ and $H_{2}O$. Choose the correct answer from the options given below:

What are $A, B$ and $C$ in the following reaction?
$Ar-N_2^+ BF_4^- \xrightarrow{NaNO_2, \Delta, Cu} A + B + C$

The product $(A)$ is: