In the following reaction,the suitable starting reagent $P$ is

The chemical reaction shown in the image represents the reduction of a diazonium salt to an aromatic hydrocarbon. Identify the reagent typically used for this transformation.

The major product $A$ is:

Which of the following will give $N_2$ gas on treatment with nitrous acid?

In the reactions given below,
$R-Cl \xrightarrow{(i)\, KCN, (ii)\, LiAlH_4}$ Product $A$
$R-Cl \xrightarrow{(i)\, AgCN, (ii)\, LiAlH_4}$ Product $B$
the compounds $A$ and $B$ are

Which of the following products is a Schiff base?
$C_2H_5NH_2 \xrightarrow{HNO_2} a$
$C_2H_5NH_2 \xrightarrow{C_6H_5CHO} b$
$C_2H_5NH_2 \xrightarrow{NOCl} c$
$C_2H_5NH_2 \xrightarrow{C_6H_5SO_2Cl} d$