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Solution


Q.

The correct order of strengths of the carboxylic acids

is                                                                     [2016]
1 I > II > III  
2 II > III > I  
3 III > II > I  
4 II > I > III  

Ans.

(2)

Acidic strength ∝ –I effect

As oxygen is more electron withdrawing, (II) and (III) show greater –I effect than (I). Thus, (I) is least acidic. Out of (II) and (III), (II) is more acidic than (III) as distance of O increases from –COOH group and the acidic strength decreases.