Which of the following is the strongest base in an aqueous solution?

In the given reaction,$[X]$ is:
$4-\text{nitrostyrene} \xrightarrow{[X]} 4-\text{ethylaniline}$

Which among the following compounds is a primary amine?

Biologically active adrenaline and ephedrine,which are used to increase blood pressure,contain which of the following functional groups?

$A$ student performed an analysis of an aliphatic organic compound '$X$' which, upon analysis, gave $C=61.01\%$, $H=15.25\%$, $N=23.74\%$. This compound, on treatment with $HNO_2/H_2O$, produced another compound '$Y$' which did not contain any nitrogen atom. However, the compound '$Y$' upon controlled oxidation produced another compound '$Z$' that responded to the iodoform test. The structure of '$X$' is:

What is the product of the following reaction?