What is obtained by the reaction of acetamide with bromine and caustic soda?

Which of the following amines cannot be prepared by the Gabriel phthalimide synthesis method?

Suggest a route by which the following conversion can be accomplished: Cyclohexanecarboxamide to $N$-methylcyclohexanamine.

Which of the following reactions are used in the preparation of aliphatic primary amines?
$I$. Gabriel-phthalimide reaction
$II$. Hoffmann Bromamide reaction
$III$. Carbylamine reaction
$IV$. Sandmeyer reaction

Consider the following set of reactions. What are $A$ and $B$ respectively?
$Y \xleftarrow{B} C_6H_5CN \xrightarrow{A} X$
($Y$ reacts with $2,4-DNP$)
($X$ dissolves in dil. $HCl$)

Identify the correct $A$,$B$,and $C$ in the reaction sequence given below: