Nessler's reagent is

Liebermann's nitroso reaction is used for testing:

Identify the incorrect statement based on the following reaction sequence:
$C_6H_5N_2^+Cl^-$ $\xrightarrow{H_3PO_2/H_2O} A$ $\xrightarrow{SO_3} B$ $\xrightarrow{PCl_5} C$ $\xrightarrow{EtNH_2} D$

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?

Primary,secondary and tertiary amines can be separated using :-

$A$ positive carbylamine test is given by