${\mathrm{CH}}_3{\mathrm{NHCH}}_3$ and ${\left({\mathrm{CH}}_3\right)}_3\mathrm{N}$ can be chemically distinguished by

In the following reactions

$\mathrm{Acetanilide}\underset{{\mathrm{CH}}_3\mathrm{COOH}}{\overset{{\mathrm{Br}}_2}{\to }}\mathrm{C}\left(\mathrm{major}\right)\stackrel{{\mathrm{H}}^{+}}{\to }\mathrm{D}.$ $\mathrm{D}$ is

In the given set of reactions

 $\mathrm{D}$ is

Consider the following reaction

 Major product $\mathrm{B}$ is

The correct increasing order of basic strength for the following compounds is