Identify the medium required for the formation of $p$-Hydroxyazobenzene from benzene diazonium chloride and phenol.

Amongst the following,the most basic compound is:

Identify product $A$ in the following reaction:
$C_6H_5N_2^+Cl^- \xrightarrow{C_2H_5OH} A + N_2 + CH_3CHO + HCl$

In the given reaction sequence,what is $Z$?
Aniline $\xrightarrow{CH_3COCl} X$ $\xrightarrow{Br_2/AlBr_3} Y$ $\xrightarrow{H_3O^+} Z$

Which of the following statements is not correct?

$n$-Butylamine $(I)$,diethylamine $(II)$,and $N,N$-dimethylethylamine $(III)$ have the same molecular mass. Arrange them in the increasing order of their boiling points.