First slide

Acidic Strength

Question

The acid with highest $P^{k_{a}}$ value is

Moderate

A
B
C
D

Solution

K_a $\propto$ Acidic strength , thus lesser K_a and higher $P^{k_{a}}$ 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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