Urea is

Which of the following amines,on heating with chloroform and ethanolic potassium hydroxide,produces a foul smell?

The reagent$(s)$ used for the conversion of benzene diazonium hydrogensulphate to benzene is/are:

Arrange the following in the order of their basic strength:

Arrange the following in increasing order of their basic strength:
$(i)$ $C_2H_5NH_2, C_6H_5NH_2, NH_3, C_6H_5CH_2NH_2$ and $(C_2H_5)_2NH$
$(ii)$ $C_2H_5NH_2, (C_2H_5)_2NH, (C_2H_5)_3N, C_6H_5NH_2$
$(iii)$ $CH_3NH_2, (CH_3)_2NH, (CH_3)_3N, C_6H_5NH_2, C_6H_5CH_2NH_2$

The major product $(R)$ of the following reaction is:
Aniline $\xrightarrow[{pyridine}]{{CH_3COCl}}$ $P$ $\xrightarrow[{CH_3COOH}]{{Br_2}}$ $Q$ $\xrightarrow{{{H_3O^{+}}}}$ $R$