Chemical Properties of Amines

The increasing order of basic strengths in their aqueous solutions is

 ${\mathrm{NH}}_3,{\mathrm{CH}}_3{\mathrm{NH}}_2,{\left({\mathrm{CH}}_3\right)}_2\mathrm{NH},{\left({\mathrm{CH}}_3\right)}_3\mathrm{N}$

State which of the following statements are true:

(i)  $p{K}_b$  value for aniline is less than that for methylamine.

(ii) Methylamine in water reacts with ferric chloride to give a precipitate of ferric hydroxide.

(iii) Aniline does not undergo Friedel-Crafts reaction.

State which of the following statements are true:

(i)  $\text{p}{\text{K}}_{\text{b}}$ value for aniline is less than that for methylamine.

(ii) Methylamine in water reacts with ferric chloride to give a precipitate of ferric hydroxide.

(iii) Aniline does not undergo Friedel-Crafts reaction.

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

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

 (i) Aniline does not undergo Friedel-Crafts Reaction.

(ii) Aliphatic amines are stronger bases than aromatic amines.

State if the above two statements are true or false:

Amongst the following the most basic compound is –

Amongst the following the most basic compound is: