Give an example of a Zwitter ion.

Arrange the following compounds in decreasing order of basicity. Give reason.

Methylamine, dimethylamine, aniline, N-methyl aniline.

Complete the following equation and balance:

${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH} \stackrel{{\mathrm{PCl}}_5}{\to } \mathrm{A} \stackrel{\mathrm{KCN}}{\to } \mathrm{B} \stackrel{{\mathrm{H}}_3{\mathrm{O}}^{+}}{\to } \mathrm{C} \stackrel{{\mathrm{NH}}_3}{\to } \mathrm{D}$

Name a tertiary amine in the IUPAC system for which the following compounds are isomers.

 and 

${\mathrm{C}}_2{\mathrm{H}}_5-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{NH}}_2$