The correct sequence of acidic strength of th | vedclass

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Question

(A) The acidic strength of carboxylic acids depends on the electron-donating effect of the alkyl group attached to the $-COOH$ group. Alkyl groups exh

Vedclass · Accepted Answer

$HCOOH > CH_3COOH > CH_3CH_2COOH > CH_3CH_2CH_2COOH$

Vedclass · Answer

(A) The acidic strength of carboxylic acids depends on the electron-donating effect of the alkyl group attached to the $-COOH$ group. Alkyl groups exhibit a $+I$ (positive inductive) effect,which destabilizes the carboxylate anion and decreases the acidic strength. As the size of the alkyl group increases,the $+I$ effect increases,thereby decreasing the acidic strength. $HCOOH$ has no alkyl group,so it is the strongest acid. Comparing the others: $CH_3COOH$ (methyl group) > $CH_3CH_2COOH$ (ethyl group) > $CH_3CH_2CH_2COOH$ (propyl group). Therefore,the correct decreasing order is: $HCOOH > CH_3COOH > CH_3CH_2COOH > CH_3CH_2CH_2COOH$.

The correct sequence of acidic strength of the following aliphatic acids in their decreasing order is: $CH_3CH_2COOH$,$CH_3COOH$,$CH_3CH_2CH_2COOH$,$HCOOH$

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