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  4. The acid strength obeys the order. Arrange the following carboxylic acids in the decreasing order of their reactivities

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Q. The acid strength obeys the order. Arrange the following carboxylic acids in the decreasing order of their reactivities

J & K CETJ & K CET 2007Aldehydes Ketones and Carboxylic Acids

Solution:

The groups, which have greater $-I$ effect increases the acidic strength by decreasing negative charge on the carboxylate ion. As the acidic strength increases, reactivity of the groups decreases So, correct order is
$Cl _{3} CCOOH < Cl _{2} CHCOOH < ClCH _{2} COOH < CH _{3} COOH$