The correct order of the basic strength of methyl substituted amines in aqueous solution is :

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🧠 The Aqueous Basic Strength Duel
Basic strength of amines in water is a tug-of-war between three factors:
1. +I Effect: Increases with more methyl groups ().
2. Solvation Effect: Decreases with more methyl groups as H-bonding is blocked ().
3. Steric Hindrance: Increases with more methyl groups ().

🗺️ The Methyl Rule
In aqueous solution, for Methyl substituted amines:
- The inductive effect and solvation effects achieve harmony at the Secondary () amine.
- The next strongest is the Primary (

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