Hinsberg's reagent is

Liebermann's nitroso reaction is used for testing:

An aromatic compound $A$ reacts with $Zn/NH_4Cl$,and the filtrate is then added to an ammoniacal silver nitrate solution,resulting in a black precipitate. Which group does compound $A$ contain?

Give one chemical test to distinguish between the following pairs of compounds:
$(i)$ Methylamine and dimethylamine
$(ii)$ Secondary and tertiary amines
$(iii)$ Ethylamine and aniline
$(iv)$ Aniline and benzylamine
$(v)$ Aniline and $N$-methylaniline.

Match the following:

$Test/Method$	$Reagent$
$(i)$ Lucas Test	$(a)$ $C_6H_5SO_2Cl/aq. KOH$
$(ii)$ Dumas method	$(b)$ $HNO_3/AgNO_3$
$(iii)$ Kjeldahl's method	$(c)$ $CuO/CO_2$
$(iv)$ Hinsberg Test	$(d)$ Conc. $HCl$ and $ZnCl_2$
	$(e)$ $H_2SO_4$

Which amine does not give the Hofmann mustard oil reaction?