What is the correct order of acidic strength?

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Question

(A) The acidic strength of carboxylic acids is inversely proportional to the $+I$ (inductive) effect of the alkyl group attached to the carboxylate gr

Vedclass · Accepted Answer

$HCOOH > CH_3COOH > C_2H_5COOH$

Vedclass · Answer

(A) The acidic strength of carboxylic acids is inversely proportional to the $+I$ (inductive) effect of the alkyl group attached to the carboxylate group.$HCOOH$ has no alkyl group (only $H$),while $CH_3COOH$ has a methyl group ($+I$ effect) and $C_2H_5COOH$ has an ethyl group (stronger $+I$ effect than methyl).As the $+I$ effect increases,the stability of the conjugate base decreases,thereby decreasing the acidic strength.Therefore,the correct order is $HCOOH > CH_3COOH > C_2H_5COOH$.

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