i) OH 1 mole partial 

ii) $B{r}_2 OH$

The product A is

 The order of basic strength in gas phase of the following compound would be:

 $\begin{array}{l}{\text{i) C}}_{\text{2}}{\text{H}}_{\text{5}}{\text{NH}}_{\text{2}}\text{,}\\ {\text{ii) (C}}_{\text{2}}{\text{H}}_{\text{5}}{\text{)}}_{\text{2}}\text{NH,}\\ {\text{iii) (C}}_{\text{2}}{\text{H}}_{\text{5}}{\text{)}}_{\text{3}}\text{N}\mathrm{and}\\ {\text{iv) CH}}_{\text{3}}{\text{NH}}_2.\end{array}$

The following pairs of computes can be distinguished by which of the following tests:

 (i) Ethylamine and aniline

(ii) Aniline and N-methylaniline