Arrange the basicity of the given compounds in decreasing order: 
($\mathrm{i}$) ${\mathrm{CH}}_3-{\mathrm{CH}}_2-{\mathrm{NH}}_2$
($\mathrm{ii}$) ${\mathrm{CH}}_2=\mathrm{CH}-{\mathrm{NH}}_2$
($\mathrm{iii}$) $\mathrm{CH}\equiv C-{\mathrm{NH}}_2$

Decreasing order of basicity is:

Arrange the following in increasing order of $\mathrm{pH}$ value:

Find the order of basic strength. (If $\mathrm{R}=\mathrm{Me}$ )
 

The correct decreasing order of basicity in the following compound is: