JEE Main202325 Jan 2023Morning ShiftChemistryAminesActual
The correct order in aqueous medium of basic strength in case of methyl substituted amines is:
Options
- AMe 2 NH > MeNH 2 > Me 3 N > NH 3
- BMe 2 NH > Me 3 N > MeNH 2 > NH 3
- CNH 3 > Me 3 N > MeNH 2 > Me 2 NH
- DMe 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 .