The correct order of the basic strength of methyl substituted amines in aqueous solution is:
- A(CH
3
)
2
NH>CH
3
NH
2
>(CH
3
)
3
N - B(CH
3
)
3
N>CH
3
NH
2
>(CH
3
)
2
NH - C(CH
3
)
3
N>(CH
3
)
2
NH>CH
3
NH
2
- DCH
3
NH
2
>(CH
3
)
2
NH>(CH
3
)
3
N
Solution & Step-by-step Explanation
In aqueous solution, basicity is determined by a combination of +I effect, solvation effect (H-bonding), and steric hindrance.
For Methyl substituted amines:
Order: Secondary (2
∘
) > Primary (1
∘
) > Tertiary (3
∘
).
(CH
3
)
2
NH>CH
3
NH
2
>(CH
3
)
3
N
(For Ethyl amines, the order is 2
∘
>3
∘
>1
∘
).
For Methyl substituted amines:
Order: Secondary (2
∘
) > Primary (1
∘
) > Tertiary (3
∘
).
(CH
3
)
2
NH>CH
3
NH
2
>(CH
3
)
3
N
(For Ethyl amines, the order is 2
∘
>3
∘
>1
∘
).