The correct order in aqueous medium of basic strength in case of...

The correct order in aqueous medium of basic strength in case of methyl substituted amines is:

Options

A ${Me}_{2}NH > {MeNH}_{2} > {Me}_{3}N > {NH}_{3}$
B ${Me}_{2}NH > {Me}_{3}N > {MeNH}_{2} > {NH}_{3}$
C ${NH}_{3} > {Me}_{3}N > {MeNH}_{2} > {Me}_{2}NH$
D ${Me}_{3}N > {Me}_{2}NH > {MeNH}_{2} > {NH}_{3}$

Correct answer

A. ${Me}_{2}NH > {MeNH}_{2} > {Me}_{3}N > {NH}_{3}$

Step-by-step solution

In aqueous medium basic strength is dependent on electron density on nitrogen as well as solvation of cation formed after accepting ${H}^{+}$ . In protic solvent like water, the order of basic strength is

${Me}_{2}NH > {MeNH}_{2} > {Me}_{3}N > {NH}_{3}$ .

This happens beacuse in case of ${Me}_{2}NH$ there will be optimum (+I) and solvation while in ${MeNH}_{2}$ has more significant hydration than ${Me}_{3}N$ .

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