Which is the best method for the preparation of $N$-methylethanamide?

$9.3 \ g$ of pure aniline is treated with bromine water at room temperature to give a white precipitate of the product '$P$'. The mass of product '$P$' obtained is $26.4 \ g$. The percentage yield is $......... \ \%$.

Which of the following is the strongest base?

The final product $[B]$ is :

In the given chemical reaction $CH_3CH_2NH_2 + CHCl_3 + 3KOH \rightarrow X + Y + 3H_2O$,what are $X$ and $Y$ respectively?

Which of the following has the highest $pK_b$ value?