Consider the above reaction,the product $A$ and product $B$ respectively are ...

What product is formed when ethylamine reacts with nitrous acid?

$H_3CCONH_2 + Br_2 + 4NaOH \longrightarrow Y + Na_2CO_3 + 2NaBr + 2H_2O$
What is $Y$ in the above reaction?

Predict the product of the following reaction:
$C_6H_5NHCH_3 + NaNO_2 + HCl \rightarrow \text{Product}$

What is the correct order of increasing basic strength for the bases $NH_3$,$CH_3NH_2$,and $(CH_3)_2NH$?

$A$ hydrocarbon $A$ $(C_{4}H_{8})$ on reaction with $HCl$ gives a compound $B$ $(C_{4}H_{9}Cl)$ which on reaction with $1 \ mol$ of $NH_{3}$ gives compound $C$ $(C_{4}H_{11}N)$. On reacting with $NaNO_{2}$ and $HCl$ followed by treatment with water,compound $C$ yields an optically active compound $D$. The compound $D$ is