Which of the following gives $RNC$ when reacted with $CHCl_3$ and $KOH$?

For the identification of $\beta$-naphthol using dye test,it is necessary to use :

$A$ positive carbylamine test is given by :-
$(a)$ $N,N$-Dimethylaniline
$(b)$ $2,4$-Dimethylaniline
$(c)$ $N$-methyl-$o$-methylaniline
$(d)$ $p$-Methylbenzylamine

Carbylamine test is performed by heating alcoholic $KOH$ with:

In the carbylamine test for primary amines,the resulting foul-smelling product is:

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?