When aniline is treated with sodium nitrite and hydrochloric acid at $0\,^{\circ}C$,it gives:

Consider the following compounds:
$I. CH_3-CH_2-NH_2$
$II. Ph-CH_2-NH_2$
$III. Ph-NH_2$
The correct order of their basic strength is:

Identify the products $y$ and $x$ in the following reaction sequence:
$C_6H_5CONH_2 \xrightarrow{NaOBr} y$
$C_6H_5CONH_2 \xrightarrow[(ii) H_3O^+]{(i) C_6H_5SO_2Cl / py, \Delta} x$

How many moles of ethyl bromide are required for the formation of $1 \ mole$ of $N,N$-diethylethanamine from ethylamine?

Identify $Y$ in the following reaction sequence:
$C_6H_5NH_2$ $\xrightarrow[5^{\circ}C]{NaNO_2 + HCl} X$ $\xrightarrow{H_3PO_2 / H_2O} Y$

The correct order of decreasing basic strengths of $x$ (piperidine),$y$ (caprolactam derivative),and $z$ ($3$,$4$,$5$,$6$-tetrahydropyridine) is: