First slide
Acidic Strength

The acid with highest Pka value is


Ka  Acidic strength , thus lesser Ka and higher Pka means lesser acidic strength ;
-CH3 at meta position . . . +I effect . . .EDG 
-OCH3 at para position . . .-I, +M (-I < +M) . . .EDG
-NO2 at para posotion. . .-I, -M . . .EWG
Electron donating power of -OCH3 > -CH3 
EDG decrease acidic strength;
EWG increase acidic strength ;

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