AIIMS 2018 Chemistry Effect of Substituents on Basicity MCQ Question

Option A is correct because it reflects the increasing basic strength of the compounds based on their ability to donate electron pairs. Typically, stronger bases have less electronegative atoms or groups that can stabilize positive charge less effectively, leading to greater basicity. For example, in the series I > II > III > IV, the compounds likely differ in their electronegativity or resonance effects, where I has the least electronegative atom, making it the strongest base. Other options are incorrect as they misrepresent the relative basic strengths by incorrectly ranking the compounds based on their electron-donating ability or steric hindrance.