The correct order of basic nature in aqueous solution for the bases

$\mathrm{NH}_3, \mathrm{H}_2 \mathrm{~N}-\mathrm{NH}_2, \mathrm{CH}_3 \mathrm{CH}_2 \mathrm{NH}_2,\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_2 \mathrm{NH}$ and $\left(\mathrm{CH}_3 \mathrm{CH}_2\right)_3 \mathrm{~N}$ is :

Which one of the following reaction sequences will give an azo dye?

In the following substitution reaction :

Product 'P' formed is :

The steam volatile compounds among the following are :

$\text { Choose the correct answer from the options given below : }$