The correct decreasing order of (pK\_a) is | Chemistry | SolveeIt

Question

The correct decreasing order of $pK_a$ is

II > IV > I > III

IV > II > III > I

III > II > IV > I

IV > I > II > III

Answer

II > IV > I > III

Explanation

Solution

Weaker acids have higher $pk_{a}-OCH_3$ at meta-position exerts only $-I$ effect, hence increases the acidity. $-I$ effect order : - $NO_2 >\, -OCH_3 >\, -Cl$ $-CH_3$ has $+I$ effect

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