Conversion of $X$ to $Y$ in the above reaction is

Identify the correct statements about $Z$.

$$ \mathrm{C}_2 \mathrm{H}_5 \mathrm{NH}_2 \xrightarrow[0^{\circ} \mathrm{C}]{\mathrm{NaNO}_2 / \mathrm{HCl}} X \xrightarrow{\mathrm{H}_2 \mathrm{O}} Y \xrightarrow{\mathrm{Cu} / 573 \mathrm{~K}} Z $$

I. $Z$ is an aldehyde.

II. $Z$ undergòes Cannizzaro reaction.

III. $Z$ gives iodoform test.

IV. $Z$ does not give, test with Tollens' reagent.

Match the following.

List -I (Amine)	List -II (pKb value)
A. N,N-dimethyl aniline	I. 9.30
B. Aniline	II. 8.92
C. N-ethylethanamine	III. 9.38
D. N-methylaniline	IV. 3.00

The correct answer is

The $\mathrm{p} K_{\mathrm{a}}$ values of $X, Y, Z$ respectively are $8.3,7.1,10.2$. What are $X, Y, Z$ ?