Pure aniline is a

Identify $M$ in the following sequence of reactions:

Which of the following reacts with $CHCl_3$ and $KOH$ to produce $RNC$?

$(CH_3)_2CHCONH_2$ $\xrightarrow{Br_2/NaOH} A$ $\xrightarrow{COCl_2} B$. In this reaction sequence,$B$ is:

Find the correct order of acidity of the following compounds:
$(I)$ $C_6H_5NH_2$
$(II)$ $C_6H_5CONH_2$
$(III)$ Phthalimide
$(IV)$ $CH_3CH_2NH_2$

Identify the compound from the following having the lowest boiling point.