In aqueous solution, the basic strength of methyl-substituted amines follows a specific order due to — GOC and Organic Chemistry Basics Chemistry Question

💡 Solution & Explanation

While $3^\circ$ has the highest $+I$ effect, its bulky nature severely restricts water from hydrogen-bonding (hydrating) and stabilizing the conjugate acid. The $2^\circ$ amine strikes the perfect balance of $+I$ push and hydration space, making $2^\circ > 1^\circ > 3^\circ$ the correct aqueous order for methylamines.