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

The correct order of basicity of the following amines is:

In the following compounds,the order of basicity is as follows:

For reaction-$I$,the reagents are $CH_3CONH_2, KOH, Br_2$. For reaction-$II$,the reagents are $CH_3NH_2, CHCl_3, KOH$. What are the intermediates for reaction-$I$ and reaction-$II$ respectively?

The order of basic strength among the following amines in benzene solution is

How many moles of iodomethane are consumed in the following conversion?
$CH_3NH_2 \xrightarrow[\Delta]{CH_3I} (CH_3)_4N^{+}I^{-}$