What is the correct observed sequence of basic strength for strictly gas-phase, completely unsolvate — Amines Chemistry Question

💡 Solution & Explanation

In the gas phase, solvent effects (like hydration stabilization and steric hindrance to solvation) are completely absent. The basic strength is dictated exclusively by the electron-donating inductive (+I) effect of the alkyl groups. More alkyl groups yield higher basicity, resulting in the strict $3^\circ > 2^\circ > 1^\circ > NH_3$ order.