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The correct decreasing order of pKa is

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The correct decreasing order of pKa is

(a) II>IV>I>III

(b) IV>II>III>I

(c) III>II>IV>l

(d) Iv > l > II > III

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Best answer

Correct option (a) II>IV>I>III

Explanation:

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. 

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