Which of the following acids has the lowest p | vedclass

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(C) The $pK_a$ value is inversely proportional to the acidic strength of the acid. Stronger acids have lower $pK_a$ values. Acidic strength depends on

Vedclass · Accepted Answer

$HCOOH$

Vedclass · Answer

(C) The $pK_a$ value is inversely proportional to the acidic strength of the acid. Stronger acids have lower $pK_a$ values. Acidic strength depends on the stability of the conjugate base (carboxylate ion). Electron-donating groups (like alkyl groups) destabilize the carboxylate ion by increasing the negative charge density,thereby decreasing acidic strength. $HCOOH$ has no alkyl group attached to the carboxyl group,whereas the others have alkyl groups ($CH_3-$,$CH_3CH_2-$,$(CH_3)_2CH-$) which are electron-donating via the $+I$ effect. Therefore,$HCOOH$ is the strongest acid among the given options and has the lowest $pK_a$ value.

Which of the following acids has the lowest $pK_a$ value?

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