Molar conductivity always increases with increase in concentration of electrolyte. Among the given compounds, the molar conductivity depends upon the concentration of H+ ions. Thus, stronger the acid more will be H+ ions and more will be the molar conductivity. The order of acidic strength is Strong acidHCl>Weak acidCH3COO>Neutral saltNaCl>Salt of weak acidCH3COONa
Thus, molar conductivity at infinite dilution follows the order HCl>CH3COOH>NaCl>CH3COONa