In the reaction $CH_3CH_2CONH_2 \xrightarrow[Br_2]{NaOH} A$,the aqueous solution of $A$ is ............

Aniline,when diazotized in cold and then treated with $N,N$-dimethylaniline,gives a coloured product. Its structure would be:

For the following diazonium ions,the order of reactivity towards diazo-coupling with phenol in the presence of dilute $NaOH$ is:
$(I)$ $p-Me_2N-C_6H_4-N_2^+$
$(II)$ $p-O_2N-C_6H_4-N_2^+$
$(III)$ $p-CH_3O-C_6H_4-N_2^+$
$(IV)$ $p-CH_3-C_6H_4-N_2^+$

$R-NH-CHO \xrightarrow[\text{pyridine}]{POCl_3} \text{ product}$
In the given reaction,what will be the product?

In the given reaction sequence,$Z$ is

Reduction of nitrobenzene with $Zn$ and alcoholic $KOH$ solution results in the formation of the following compound: