Consider the basic strength of amines  in aqueous solution, which one has the smallest  $p{K}_b$ value?

In the reaction shown below, the major product(s) formed is/are

The alkene formed as a major product in the above elimination reaction is:

In the chemical reaction,

${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{NH}}_2+{\mathrm{CHCl}}_3+3\mathrm{KOH}⟶\left(\mathrm{A}\right)+\left(\mathrm{B}\right)+3{\mathrm{H}}_2\mathrm{O}$

The compounds $\left(\mathrm{A}\right)$ and $\left(\mathrm{B}\right)$ are respectively :