Among the following acids,which has the lowes | vedclass

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(B) The $pK_a$ value is inversely proportional to the acid dissociation constant $(K_a)$,i.e.,$pK_a = -\log(K_a)$.Therefore,the acid with the highest

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$HCOOH$

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(B) The $pK_a$ value is inversely proportional to the acid dissociation constant $(K_a)$,i.e.,$pK_a = -\log(K_a)$.Therefore,the acid with the highest $K_a$ value will have the lowest $pK_a$ value.Among the given carboxylic acids,formic acid $(HCOOH)$ is the strongest acid because the hydrogen atom attached to the carboxyl group exerts no electron-donating inductive effect ($+I$ effect),whereas alkyl groups in other options ($CH_3-$,$CH_3CH_2-$,$(CH_3)_2CH-$) exert a $+I$ effect,which destabilizes the carboxylate anion and decreases acidity.Thus,$HCOOH$ has the highest $K_a$ and the lowest $pK_a$ value.

Among the following acids,which has the lowest $pK_a$ value?

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