The correct decreasing order of pKa is

Question

The correct decreasing order of pKa is (A) II > I > IV > III  (B) IV > II > III > I (C) III > II > IV > I (D) IV > I > II > III

Tardigrade Admin · Accepted Answer

Weaker acids have higher pka-OCH3 at meta-position exerts only -I effect, hence increases the acidity. -I effect order: - NO2 > -OCH3 > -Cl -CH3 has +I effect

Q. The correct decreasing order of $p K_{a}$ is

$II > I > I V > III$

IV > II > III > I

III > II > IV > I

IV > I > II > III

Weaker acids have higher $p k_{a} - OC H_{3}$ at meta-position exerts only $- I$ effect, hence increases the acidity.

$- I$ effect order : - $N O_{2} > - OC H_{3} > - Cl$

$- C H_{3}$ has $+ I$ effect

Q. The correct decreasing order of pKa​ is

II>I>IV>III